JP2006047066A

JP2006047066A - Gas leakage detection mechanism

Info

Publication number: JP2006047066A
Application number: JP2004227244A
Authority: JP
Inventors: Koji Hotta; 弘司堀田; Tsutomu Ninomiya; 勉二宮; Hideo Miyahara; 英男宮原
Original assignee: Obayashi Corp; Toyota Motor Corp
Current assignee: Obayashi Corp; Toyota Motor Corp
Priority date: 2004-08-03
Filing date: 2004-08-03
Publication date: 2006-02-16
Anticipated expiration: 2024-08-03
Also published as: JP4372637B2

Abstract

<P>PROBLEM TO BE SOLVED: To propose a gas leakage detection mechanism suited also to cases where the scale or area of a detecting object on gas leakage is large and used for detecting leakage while rapidly exhausting collected gas. <P>SOLUTION: In this mechanism for detecting the occurrence of leakage of a gas lighter than air, upwardly protrusive grooves 11 are formed on a ceiling surface 10 of a space where gas leakage occurs, and gas concentration detection sensors 12 are provided at the highest positions within the grooves 11. Closable opening parts 11b capable of communicating with the exterior are formed in upper parts of the grooves 11 or in walls forming their vicinity. With the detection sensors 12 and an opening/closing drive means for the opening parts 11b connected to a controller 15, control is performed so that the opening parts 11b are opened when detecting that gas concentration exceeds a prescribed concentration. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、配管等から漏洩したガスを迅速且つ確実に検知するための技術に関する。 The present invention relates to a technique for quickly and reliably detecting a gas leaked from piping or the like.

従来、水素ガスを扱う施設において、水素ガスの漏洩を迅速且つ確実に検出する方法としては、水素ガスが通過する配管を二重配管構造等の密閉構造として、漏洩した水素ガスを捕集して検出する方法が知られている。この検出構造では、配管が密である場合や、複雑である場合や、配管経路が長い場合等には、配管を二重に構成したり、捕集機構を構成したり、メンテナンスしたりすることが複雑となり、また、コストがかかるという不具合があった。
そこで、より簡易な構造にて水素ガスの漏出を検出する方法が提案されている。例えば、特許文献１や特許文献２に記載の技術である。 Conventionally, in a facility that handles hydrogen gas, as a method of quickly and reliably detecting leakage of hydrogen gas, the piping through which hydrogen gas passes is made a sealed structure such as a double piping structure, and the leaked hydrogen gas is collected. A method of detecting is known. With this detection structure, when the piping is dense, complicated, or when the piping route is long, the piping should be doubled, the collection mechanism configured, and maintained. However, there was a problem that it was complicated and costly.
Thus, a method for detecting leakage of hydrogen gas with a simpler structure has been proposed. For example, there are techniques described in Patent Document 1 and Patent Document 2.

特許文献１では、配管における破損検出装置が公開されている。この技術では、略中央部に水素濃度測定器が取り付けられたフードを配管に被せ、破損箇所から流出するガスを該フードで捕集する。水素は極めて軽い気体であるので、検出したい箇所にフードを被せることで、容易に水素が捕捉することができる。 In patent document 1, the damage detection apparatus in piping is disclosed. In this technique, a pipe with a hood having a hydrogen concentration measuring device attached to a substantially central portion is put on the pipe, and the gas flowing out from the damaged portion is collected by the hood. Since hydrogen is an extremely light gas, it can be easily captured by placing a hood over the location to be detected.

また、特許文献２では、燃料電池用ケースの構造が公開されている。この技術は、燃料電池用ケース上部材の少なくとも一部に空気より軽い気体を捕集する捕集部を形成し、該捕集部に水素を検出する水素検出センサを取り付けたものである。ケース内部において漏出した水素は、漏出した箇所に拘わらず、空気よりも極めて軽いためにケース上部材に沿って最上部に形成された水素捕集部に集まる。水素捕集部に集まった水素は、水素捕集部の略中央に取り付けられた水素検出センサによって直ちに検出される。
特開昭５８−５６２７号公報特開２００２−３６７６４８号公報 Patent Document 2 discloses the structure of a fuel cell case. In this technique, a collecting part that collects a gas lighter than air is formed on at least a part of the upper member of the fuel cell case, and a hydrogen detection sensor that detects hydrogen is attached to the collecting part. The hydrogen leaked inside the case is much lighter than air regardless of the leaked location, and therefore gathers in the hydrogen collecting portion formed at the top along the case upper member. Hydrogen collected in the hydrogen collection unit is immediately detected by a hydrogen detection sensor attached to the approximate center of the hydrogen collection unit.
JP 58-5627 A JP 2002-367648 A

上記従来技術では、水素ガスの漏洩を発生する箇所を、二重配管等して個々に被覆するする必要がないので、構造が簡易となり、コストの削減も実現することができる。
しかし、ガス漏洩の検出対象の規模や面積が大きい場合には、フードやケースを形成することは困難である。
また、捕集した水素ガスをいかに処理するかが課題となる。水素ガスは空気と混合したのち、何らかの原因により引火すれば、爆発するおそれがあるため、速やかに大気拡散させる事が好ましい。 In the above-described prior art, it is not necessary to individually coat the locations where hydrogen gas leaks with a double pipe or the like, so that the structure is simplified and the cost can be reduced.
However, it is difficult to form a hood or a case when the scale or area of the gas leak detection target is large.
Another problem is how to treat the collected hydrogen gas. It is preferable that hydrogen gas is quickly diffused into the atmosphere because it may explode if it is ignited for some reason after it is mixed with air.

本発明の解決しようとする課題は以上の如くであり、次にこの課題を解決するための手段を説明する。 The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

即ち、請求項１においては、空気よりも軽い気体の漏洩の発生を検出するための機構であって、気体の漏洩が発生する空間の天井面に、上方へ凸状の溝を形成し、該溝の内部における最高位置に気体濃度検出センサを設けたものである。 That is, in claim 1, a mechanism for detecting the occurrence of gas leakage lighter than air, wherein a convex groove is formed on the ceiling surface of the space where the gas leakage occurs, A gas concentration detection sensor is provided at the highest position inside the groove.

請求項２においては、前記溝の上部又は上部近傍を構成する壁に、外部と連通可能な開口部を形成し、該開口部を開閉可能としたものである。 According to a second aspect of the present invention, an opening that can communicate with the outside is formed in the wall that forms the upper part of the groove or the vicinity of the upper part, and the opening can be opened and closed.

請求項３においては、前記気体濃度検出センサと前記開口部の開閉駆動手段とを、制御手段に接続し、前記気体濃度検出センサにて検出された気体濃度が所定濃度を超えると、制御手段が前記開口部の開閉駆動手段を駆動し、開口部を開放させるよう制御するものである。 According to a third aspect of the present invention, the gas concentration detection sensor and the opening / closing driving means of the opening are connected to the control means, and when the gas concentration detected by the gas concentration detection sensor exceeds a predetermined concentration, the control means The opening / closing driving means is driven to control to open the opening.

本発明の効果として、以下に示すような効果を奏する。 As effects of the present invention, the following effects can be obtained.

請求項１においては、ガス漏洩の検出対象の規模や面積が大きい場合においても、ガス漏洩検出機構を簡易に構成することができる。 According to the first aspect of the present invention, the gas leak detection mechanism can be easily configured even when the scale and area of the gas leak detection target are large.

請求項２においては、開口部を開放して溝に流入した気体を大気拡散させることができる。 According to the second aspect of the present invention, the gas flowing into the groove can be diffused into the atmosphere by opening the opening.

請求項３においては、気体の漏洩を検出するとともに、漏洩した気体を内部に滞留させることなく排気して、大気拡散させることができる。 According to the third aspect of the present invention, it is possible to detect the leakage of the gas and exhaust the leaked gas without causing it to stay inside to diffuse into the atmosphere.

次に、発明の実施の形態を説明する。
図１は本発明の実施例に係るガス漏洩検出機構の正面図、図２は図１におけるＸ−Ｘ矢視断面図、図３はガス漏洩検出機構の応用例を示す図、図４は流入溝の別形態を示す図である。
図５はガス漏洩検出機構の制御機構を示すブロック図である。 Next, embodiments of the invention will be described.
1 is a front view of a gas leak detection mechanism according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line XX in FIG. 1, FIG. 3 is a diagram showing an application example of the gas leak detection mechanism, and FIG. It is a figure which shows another form of a groove | channel.
FIG. 5 is a block diagram showing a control mechanism of the gas leakage detection mechanism.

本発明に係るガス漏洩検出機構９は、水素ガスの漏洩の発生を検出するための機構である。但し、検出する気体は、水素ガスに限定されることなく、他の空気よりも軽い気体を検出するために本発明に係るガス漏洩検出機構９を利用することがでできる。 The gas leak detection mechanism 9 according to the present invention is a mechanism for detecting the occurrence of hydrogen gas leak. However, the gas to be detected is not limited to hydrogen gas, and the gas leak detection mechanism 9 according to the present invention can be used to detect a gas lighter than other air.

前記ガス漏洩検出機構９は、図１及び図２に示す如く、建物７の天井部８に設けられる。
但し、ガス漏洩検出機構９を設ける場所は建物に限定されるものではなく、様々な用途に該ガス漏洩検出機構９を応用させることができる。例えば、図３（ａ）に示す如く、ガス配管４２の接続部に被せるボックス４１にガス漏洩検出機構９を備え、配管接続部のガス漏洩を検出したり、図３（ｂ）に示す如く、燃料電池用ケース４３にガス漏洩検出機構９を備えて、燃料電池スタック４４のガス漏洩を検出したりすることができる。 The gas leak detection mechanism 9 is provided on the ceiling 8 of the building 7 as shown in FIGS.
However, the place where the gas leak detection mechanism 9 is provided is not limited to a building, and the gas leak detection mechanism 9 can be applied to various uses. For example, as shown in FIG. 3A, the box 41 that covers the connection portion of the gas pipe 42 is provided with the gas leak detection mechanism 9 to detect gas leak in the pipe connection portion, or as shown in FIG. The gas leak detection mechanism 9 is provided in the fuel cell case 43 so that the gas leak of the fuel cell stack 44 can be detected.

図１及び図２に示す如く、ガス漏洩検出機構９を備える建物７の天井部８において、天井面１０に上方へ凸状の流入溝１１・１１・・・が形成される。該流入溝１１・１１・・・は天井面１０を構成する天井板に一体的に形成される。流入溝１１は建物７の天井部８における水素ガス捕集部として機能する。
流入溝１１は、天井面１０において複数本が平行に形成されており、少なくとも、漏洩の可能性のある設備上方の天井部の一部分において、好ましくは、建物７の天井部全域に亘って、設けられる。 As shown in FIGS. 1 and 2, in the ceiling portion 8 of the building 7 having the gas leakage detection mechanism 9, upward inflow grooves 11, 11... Are formed on the ceiling surface 10. The inflow grooves 11, 11... Are formed integrally with a ceiling plate constituting the ceiling surface 10. The inflow groove 11 functions as a hydrogen gas collecting part in the ceiling part 8 of the building 7.
A plurality of inflow grooves 11 are formed in parallel on the ceiling surface 10, and are preferably provided over at least a part of the ceiling portion above the facility that may leak, over the entire ceiling portion of the building 7. It is done.

本実施例においては、前記流入溝１１の断面形状を、中央上部に溝内部において最も高い位置に当たる部分（最上部１１ａ）が形成される略五角形状としている。最上部１１ａは、流入溝１１に亘って線状に延在している。
但し、流入溝１１の断面形状はこれに限定されるものではなく、流入溝１１の内部において最も高い位置に当たる部分（最上部）が該流入溝１１の方向に亘って線状に形成されるものとすることができる。例えば、上下逆Ｕ字状としたり（図４（ａ））、片流れ状としたり（図４（ｂ））、三角状としたり（図４（ｃ））、することができる。 In this embodiment, the cross-sectional shape of the inflow groove 11 is a substantially pentagonal shape in which a portion corresponding to the highest position (the uppermost portion 11a) in the groove is formed at the upper center portion. The uppermost part 11 a extends linearly across the inflow groove 11.
However, the cross-sectional shape of the inflow groove 11 is not limited to this, and the portion corresponding to the highest position (uppermost portion) inside the inflow groove 11 is formed in a line shape in the direction of the inflow groove 11. It can be. For example, it can be upside down U-shaped (FIG. 4A), single-flowed (FIG. 4B), or triangular (FIG. 4C).

そして、前記流入溝１１の最上部１１ａには気体濃度検出センサ１２が備えられる。気体濃度検出センサ１２は一本の流入溝１１につき、該流入溝１１の長さに応じて複数個設けられる。本実施例では、気体濃度検出センサ１２は流入溝１１の最上部１１ａに沿って所定間隔ごとに設置される。
気体濃度検出センサ１２は、水素ガスの気体濃度を検出するための手段である。各気体濃度検出センサ１２は、制御装置１５（図５）に電気的に接続されており、設定以上の濃度の水素ガスを検出すれば、制御装置１５に検出信号を送信する。 A gas concentration detection sensor 12 is provided at the uppermost part 11 a of the inflow groove 11. A plurality of gas concentration detection sensors 12 are provided for each inflow groove 11 according to the length of the inflow groove 11. In this embodiment, the gas concentration detection sensor 12 is installed at predetermined intervals along the uppermost part 11 a of the inflow groove 11.
The gas concentration detection sensor 12 is a means for detecting the gas concentration of hydrogen gas. Each gas concentration detection sensor 12 is electrically connected to the control device 15 (FIG. 5), and transmits a detection signal to the control device 15 when it detects hydrogen gas having a concentration higher than the set value.

また、前記流入溝１１の最上部１１ａ又はその近傍には、開閉可能な閉塞部材１８が備えられた開口部１１ｂが形成される（図６・図７・図１１・図１２参照）。該開口部１１ｂは建物７の外部と連通しており、流入溝１１に流入した水素ガスを建物７の外部へ排気することができる。閉塞部材１８は、開閉機構１７によって動作し、これにより、通常は閉塞部材１８にて閉塞された状態にある開口部１１ｂが、開放又は閉塞される。 In addition, an opening 11b provided with a closing member 18 that can be opened and closed is formed at or near the uppermost portion 11a of the inflow groove 11 (see FIGS. 6, 7, 11, and 12). The opening 11 b communicates with the outside of the building 7, and the hydrogen gas that has flowed into the inflow groove 11 can be exhausted to the outside of the building 7. The closing member 18 is operated by the opening / closing mechanism 17, whereby the opening 11 b normally closed by the closing member 18 is opened or closed.

そして、図５に示す如く、ガス漏洩検出機構９を制御する制御装置１５には、気体濃度検出センサ１２、警報手段１９及びモータ１６が、接続されており、警報手段１９及びモータ１６は該制御装置１５の制御を受けて動作する。
前記開閉機構１７は、電動式であって、モータ１６にて駆動される。すなわち、流入溝１１の開口部１１ｂは、開閉駆動手段としてのモータ１６及び開閉機構１７が備えられており、該モータ１６の動力を利用して、開口部１１ｂが開閉駆動される。 As shown in FIG. 5, a gas concentration detection sensor 12, an alarm means 19 and a motor 16 are connected to a control device 15 for controlling the gas leakage detection mechanism 9, and the alarm means 19 and the motor 16 are controlled by the control device 15. It operates under the control of the device 15.
The opening / closing mechanism 17 is electrically driven and is driven by a motor 16. That is, the opening 11b of the inflow groove 11 is provided with a motor 16 and an opening / closing mechanism 17 as opening / closing driving means, and the opening 11b is driven to open / close using the power of the motor 16.

上述の如く構成されたガス漏洩検出機構９において、建物７の内部にて水素ガスの漏洩が発生すると、水素ガスは空気と比較して比重が極めて小さく軽い気体であるので、空気中を上昇する。そして、上昇して建物７の天井部８に至った水素ガスは、該天井部８でも最も高い場所に位置する流入溝１１に流入する。
流入溝１１に流入した水素ガスは、その中でも最も高い場所に位置する最上部１１ａに至り、この水素ガスが該最上部１１ａに設けられた気体濃度検出センサ１２によって検出される。 In the gas leak detection mechanism 9 configured as described above, when hydrogen gas leaks inside the building 7, the hydrogen gas is a light gas having a very small specific gravity compared to air, and therefore rises in the air. . Then, the hydrogen gas that has risen and reaches the ceiling portion 8 of the building 7 flows into the inflow groove 11 located at the highest place in the ceiling portion 8.
The hydrogen gas that has flowed into the inflow groove 11 reaches the uppermost part 11a located at the highest position, and this hydrogen gas is detected by the gas concentration detection sensor 12 provided at the uppermost part 11a.

気体濃度検出センサ１２により、気体中の水素濃度が所定の濃度より大きくなったことが検出されれば、その検出信号が制御装置１５に受信される。
制御装置１５では、気体濃度検出センサ１２からの検出信号を受けて、警報手段１９を発動させて警報を鳴らし、水素ガスの漏洩が発生したことを警報する。 If the gas concentration detection sensor 12 detects that the hydrogen concentration in the gas is greater than a predetermined concentration, the detection signal is received by the control device 15.
The control device 15 receives the detection signal from the gas concentration detection sensor 12 and activates the alarm means 19 to sound an alarm and warn that hydrogen gas leakage has occurred.

また、制御装置１５では、モータ１６に対して、開口部１１ｂを開放するように駆動信号が送信される。モータ１６より開閉機構１７に動力が伝達されて閉塞部材１８が操作され、開口部１１ｂが開放される。これにより、流入溝１１が外部と連通され、流入溝１１に流入した水素ガスが、開口部１１ｂを通じて建物７の外部へ移動し、大気に拡散される。
なお、流入溝１１の開口部１１ｂは、該流入溝１１の最上部１１ａ又はその近傍に設けられているので、水素ガスは空気との比重の差により自然に上昇し、速やかに建物７の外部へ排出される。 In the control device 15, a drive signal is transmitted to the motor 16 so as to open the opening 11 b. Power is transmitted from the motor 16 to the opening / closing mechanism 17, the closing member 18 is operated, and the opening 11b is opened. Thereby, the inflow groove 11 communicates with the outside, and the hydrogen gas that has flowed into the inflow groove 11 moves to the outside of the building 7 through the opening 11b and is diffused into the atmosphere.
Note that the opening 11b of the inflow groove 11 is provided at or near the uppermost portion 11a of the inflow groove 11, so that the hydrogen gas naturally rises due to the difference in specific gravity with the air, and quickly enters the outside of the building 7. Is discharged.

上述の如く、本発明に係るガス漏洩検出機構９では、水素ガスの漏洩を検出し警報を発するとともに、漏洩した水素ガスを内部に滞留させることなく排気して、水素ガスを速やかに大気拡散する処理を行う。
従って、水素ガスの漏洩が発生したとしても、速やかに、これに対応する処置が為されることになり、安全性の向上に寄与することができる。 As described above, in the gas leak detection mechanism 9 according to the present invention, the hydrogen gas leak is detected and an alarm is issued, and the leaked hydrogen gas is exhausted without staying inside to quickly diffuse the hydrogen gas into the atmosphere. Process.
Therefore, even if hydrogen gas leaks, measures corresponding to this are promptly performed, which can contribute to improvement of safety.

また、本発明に係るガス漏洩検出機構９では、天井面１０に、上方へ突である溝状の流路を形成して、該天井面１０を構成する板材に、天井板としての機能と、水素ガス捕集部としての機能と、漏洩気体を検出する機能とを一体的に備えている。
従って、ガス漏洩の検出対象の規模や面積が大きい場合にも、ガスの漏洩を検出する機構を備えることができる。
そして、水素ガスの漏洩を発生する箇所を、二重配管等して個々に被覆する必要がなく、また、密閉する必要もないため、構造が簡易となり、装置や配管のメンテナンスが容易となり、コストの削減も実現することができる。
なお、ガス漏洩検出機構９は建物７の天井部８に構成されるので、既存の建物であっても、天井のみを改築することによって、ガス漏洩検出機構９を備えた建物とすることができる。 Further, in the gas leakage detection mechanism 9 according to the present invention, a groove-like flow path that protrudes upward is formed on the ceiling surface 10, and the plate material constituting the ceiling surface 10 has a function as a ceiling plate, A function as a hydrogen gas collecting part and a function of detecting a leaked gas are integrally provided.
Therefore, even when the scale and area of the gas leak detection target are large, a mechanism for detecting gas leak can be provided.
In addition, it is not necessary to individually coat the locations where hydrogen gas leaks with double pipes, etc., and it is not necessary to seal the parts, which simplifies the structure and facilitates maintenance of equipment and piping. Can also be realized.
In addition, since the gas leak detection mechanism 9 is comprised in the ceiling part 8 of the building 7, even if it is an existing building, it can be set as the building provided with the gas leak detection mechanism 9 by remodeling only a ceiling. .

ここで、流入溝１１に設けられた開口部１１ｂを開閉可能とする閉塞部材１８の構成について、以下の実施例１及び実施例２において、詳細に説明する。
但し、閉塞部材１８と流入溝１１に形成される開口部１１ｂの形態は以下の実施例に示す形態に限定されるものではなく、流入溝１１の最上部又はその近傍に設けられた開口であって開閉可能であれば他の形態を採用することができる。 Here, the configuration of the closing member 18 that can open and close the opening 11b provided in the inflow groove 11 will be described in detail in the following first and second embodiments.
However, the form of the opening 11b formed in the closing member 18 and the inflow groove 11 is not limited to the form shown in the following embodiment, and is an opening provided at the uppermost part of the inflow groove 11 or in the vicinity thereof. As long as it can be opened and closed, other forms can be adopted.

次に、流入溝１１に設けられた開口部１１ｂと、該開口部１１ｂを開閉可能とする閉塞部材１８の実施例１について説明する。
図６は実施例１に係る流入溝に設けた開口部の構造を示す拡大図、図７は開口部に備えた閉塞部材の別形態を示す図、図８は流入溝に設けた開口部が開閉する様子を示す図である。 Next, Example 1 of the opening part 11b provided in the inflow groove | channel 11 and the closure member 18 which can open and close this opening part 11b is demonstrated.
FIG. 6 is an enlarged view showing the structure of the opening provided in the inflow groove according to the first embodiment, FIG. 7 is a view showing another form of the blocking member provided in the opening, and FIG. 8 shows the opening provided in the inflow groove. It is a figure which shows a mode that it opens and closes.

図６に示す如く、前記流入溝１１に形成される開口部１１ｂは、該流入溝１１における最上部１１ａ又はその近傍の壁面に複数開口される。
そして、図８にも示す如く、閉塞部材１８は開口部１１ｂの形状に合致する開口１８ａを形成した長尺板状部材であって、該閉塞部材１８をスライドさせる開閉機構１７が備えられる。モータ１６にて開閉機構１７が駆動されることによって、閉塞部材１８がスライド駆動され、これにより、通常は閉塞部材１８にて閉塞された状態にある流入溝１１の開口部１１ｂが開閉される。 As shown in FIG. 6, a plurality of openings 11 b formed in the inflow groove 11 are opened in the uppermost part 11 a of the inflow groove 11 or a wall surface in the vicinity thereof.
As shown in FIG. 8, the closing member 18 is a long plate-like member having an opening 18 a that matches the shape of the opening 11 b, and is provided with an opening / closing mechanism 17 that slides the closing member 18. When the opening / closing mechanism 17 is driven by the motor 16, the closing member 18 is driven to slide, thereby opening and closing the opening 11 b of the inflow groove 11 that is normally closed by the closing member 18.

開口部１１ｂを閉塞させるときには、流入溝１１の開口部１１ｂと閉塞部材１８の開口１８ａ以外の部分とを合致させる（図８（ａ））。
また、開口部１１ｂを外部に対して開放させるときには、開口部１１ｂを閉塞した状態から閉塞部材１８を移動して（図８（ｂ））、閉塞部材１８の開口１８ａと流入溝１１の開口部１１ｂとを合致させる（図８（ｃ））。 When closing the opening 11b, the opening 11b of the inflow groove 11 and the portion other than the opening 18a of the closing member 18 are matched (FIG. 8A).
When the opening 11b is opened to the outside, the closing member 18 is moved from the state where the opening 11b is closed (FIG. 8B), and the opening 18a of the closing member 18 and the opening of the inflow groove 11 are moved. 11b is matched (FIG. 8C).

なお、図７に示す如く、前記閉塞部材１８を、流入溝１１の壁部に形成された開口部１１ｂに嵌入され、流入溝１１の壁部を構成する板状の部材とすることもできる。この場合、開口部１１ｂを外部に対して開放する際には、モータ１６の動力にて開閉機構１７は、閉塞部材１８がその一辺を軸として外側に回転させる。 As shown in FIG. 7, the closing member 18 may be a plate-like member that is fitted into the opening 11 b formed in the wall portion of the inflow groove 11 and constitutes the wall portion of the inflow groove 11. In this case, when opening the opening 11b with respect to the outside, the opening / closing mechanism 17 causes the closing member 18 to rotate outward about one side thereof by the power of the motor 16.

次に、流入溝１１に設けられた開口部１１ｂと、該開口部１１ｂを開閉可能とする閉塞部材１８の実施例２について説明する。
図９は実施例２に係るガス漏洩検出機構の正面図、図１０は図９におけるＹ−Ｙ矢視断面図、図１１は流入溝に設けた開口部の構造を示す拡大図、図１２は流入溝に設けた開口部の別形態の構造を示す拡大図である。 Next, Example 2 of the opening part 11b provided in the inflow groove | channel 11 and the closure member 18 which can open and close this opening part 11b is demonstrated.
9 is a front view of the gas leakage detection mechanism according to the second embodiment, FIG. 10 is a cross-sectional view taken along arrow YY in FIG. 9, FIG. 11 is an enlarged view showing the structure of the opening provided in the inflow groove, and FIG. It is an enlarged view which shows the structure of another form of the opening part provided in the inflow groove | channel.

図９及び図１０に示す如く、前記流入溝１１に形成される開口部１１ｂは、該流入溝１１における最上部１１ａに複数開口され、該開口部１１ｂに筒状体３１が上方へ延設されて、該筒状体３１の上端部である外部に対する真の開口１１ｃが、前記開口部１１ｂの更に上方に設けられる。
なお、流入溝１１の最上部１１ａには、適宜位置に気体濃度検出センサ１２が備えられる。 As shown in FIGS. 9 and 10, a plurality of openings 11b formed in the inflow groove 11 are opened in the uppermost part 11a of the inflow groove 11, and a cylindrical body 31 extends upward in the opening 11b. Thus, a true opening 11c to the outside which is the upper end portion of the cylindrical body 31 is provided further above the opening 11b.
A gas concentration detection sensor 12 is provided at an appropriate position on the uppermost part 11 a of the inflow groove 11.

そして、流入溝１１の開口部１１ｂと真の開口１１ｃとの間であって筒状体３１の内部には、閉塞部材１８が備えられ、該閉塞部材１８にて筒状体３１を閉塞又は開放することによって、流入溝１１に形成された開口部１１ｂが開閉される。
前記閉塞部材１８は、筒状体３１に回転可能に支承された板状体であり、筒状体３１の内部断面を閉塞可能に形成される。閉塞部材１８は、開閉機構１７にて回転操作され、通常、筒状体３１を閉塞した状態にある閉塞部材１８が、回転することによって、筒状体３１の内部が開通され、真の開口１１ｃと開口部１１ｂとが連通する。これにより、開口部１１ｂが外部に対して開放され、流入溝１１と外部とが連通される。 A closing member 18 is provided between the opening 11 b of the inflow groove 11 and the true opening 11 c and inside the cylindrical body 31, and the cylindrical body 31 is closed or opened by the closing member 18. By doing so, the opening part 11b formed in the inflow groove | channel 11 is opened and closed.
The closing member 18 is a plate-like body that is rotatably supported by the cylindrical body 31, and is formed so as to be able to close the internal cross section of the cylindrical body 31. The closing member 18 is rotated by the opening / closing mechanism 17, and the closing member 18 that normally closes the cylindrical body 31 is rotated, whereby the inside of the cylindrical body 31 is opened and the true opening 11c is opened. And the opening 11b communicate with each other. Thereby, the opening part 11b is open | released with respect to the exterior, and the inflow groove | channel 11 and the exterior are connected.

なお、図１２に示す如く、閉塞部材１８と真の開口１１ｃとの間であって筒状体３１の内部に、ファン３３を設けることもできる。開口部１１ｂが外部に対して開放された状態において、ファン３３を駆動させることによって、流入溝１１にある気体を強制的に外部に排出させることができる。
この場合、ファン３３は、制御装置１５にて制御され、閉塞部材１８を操作して流入溝１１に形成された開口部１１ｂを開放させるとともに、ファン３３を駆動するように制御して、ガスの漏洩が検出されたときに、より速やかに漏出した気体を外部へ排気することができる。 As shown in FIG. 12, a fan 33 can be provided between the closing member 18 and the true opening 11 c and inside the cylindrical body 31. In a state where the opening 11b is open to the outside, the gas in the inflow groove 11 can be forcibly discharged to the outside by driving the fan 33.
In this case, the fan 33 is controlled by the control device 15, operates the closing member 18 to open the opening 11 b formed in the inflow groove 11, and controls to drive the fan 33, When leakage is detected, the leaked gas can be exhausted to the outside more quickly.

本発明の実施例に係るガス漏洩検出機構の正面図。The front view of the gas leak detection mechanism which concerns on the Example of this invention. 図１におけるＸ−Ｘ矢視断面図。XX arrow sectional drawing in FIG. ガス漏洩検出機構の応用例を示す図。The figure which shows the application example of a gas leak detection mechanism. 流入溝の別形態を示す図。The figure which shows another form of an inflow groove | channel. ガス漏洩検出機構の制御機構を示すブロック図。The block diagram which shows the control mechanism of a gas leak detection mechanism. 実施例１に係る流入溝に設けた開口部の構造を示す拡大図。FIG. 3 is an enlarged view showing a structure of an opening provided in an inflow groove according to the first embodiment. 開口部に備えた閉塞部材の別形態を示す図。The figure which shows another form of the closure member with which the opening part was equipped. 流入溝に設けた開口部が開閉する様子を示す図。The figure which shows a mode that the opening part provided in the inflow groove | channel opens and closes. 実施例２に係るガス漏洩検出機構の正面図。The front view of the gas leak detection mechanism which concerns on Example 2. FIG. 図９におけるＹ−Ｙ矢視断面図。YY arrow sectional drawing in FIG. 流入溝に設けた開口部の構造を示す拡大図。The enlarged view which shows the structure of the opening part provided in the inflow groove | channel. 流入溝に設けた開口部の別形態の構造を示す拡大図。The enlarged view which shows the structure of another form of the opening part provided in the inflow groove | channel.

Explanation of symbols

８天井部
９ガス漏洩検出機構
１０天井面
１１流入溝
１１ａ最上部
１１ｂ開口部
１２気体濃度検出センサ
１５制御装置
１６モータ
１７開閉機構
１８閉塞部材
１９警報手段 DESCRIPTION OF SYMBOLS 8 Ceiling part 9 Gas leak detection mechanism 10 Ceiling surface 11 Inflow groove 11a Top part 11b Opening part 12 Gas concentration detection sensor 15 Control device 16 Motor 17 Opening / closing mechanism 18 Closure member 19 Alarm means

Claims

A mechanism for detecting the occurrence of gas leakage lighter than air,
On the ceiling surface of the space where gas leakage occurs, a convex groove is formed upward,
A gas concentration detection sensor was provided at the highest position inside the groove.
A gas leakage detection mechanism characterized by that.

On the wall constituting the upper part or the vicinity of the upper part of the groove, an opening that can communicate with the outside is formed,
The opening can be opened and closed,
The gas leak detection mechanism according to claim 1.

The gas concentration detection sensor and the opening / closing driving means of the opening are connected to a control means,
When the gas concentration detected by the gas concentration detection sensor exceeds a predetermined concentration,
The control means drives the opening / closing driving means of the opening to control the opening to be opened;
The gas leak detection mechanism according to claim 2.