JPH0765276A - Gas alarm unit - Google Patents

Gas alarm unit

Info

Publication number
JPH0765276A
JPH0765276A JP21534793A JP21534793A JPH0765276A JP H0765276 A JPH0765276 A JP H0765276A JP 21534793 A JP21534793 A JP 21534793A JP 21534793 A JP21534793 A JP 21534793A JP H0765276 A JPH0765276 A JP H0765276A
Authority
JP
Japan
Prior art keywords
gas
inspection
sensor
flow
alarm
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP21534793A
Other languages
Japanese (ja)
Other versions
JP3197401B2 (en
Inventor
Hirokazu Mihashi
弘和 三橋
Mitsuteru Nishida
光輝 西田
Rei Yasui
玲 安井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
New Cosmos Electric Co Ltd
Original Assignee
New Cosmos Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by New Cosmos Electric Co Ltd filed Critical New Cosmos Electric Co Ltd
Priority to JP21534793A priority Critical patent/JP3197401B2/en
Publication of JPH0765276A publication Critical patent/JPH0765276A/en
Application granted granted Critical
Publication of JP3197401B2 publication Critical patent/JP3197401B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To obtain the gas alarm unit which can supply inspection gas, of lower density than before and speedily and securely sound although an adsorption layer which adsorbs the inspection.gas is provided, discharges the inspection gas from the adsorption layer in a relatively short time, and quickly returns to a normal detection state. CONSTITUTION:The gas alarm unit is equipped with a sensor chamber 12 wherein a gas sensor 1 is arranged and an equipment chamber 14 in an alarm unit box 11 and also equipped with a gas flow window 16 through which the gas can flow in the sensor chamber 12 and an inspection gas supply window 17 for supplying the inspection gas to the sensor chamber 12 at the time of inspection; and the gas alarm unit is constituted by providing a gas detecting element 3 made of a metal oxide semiconductor in an airtight housing 2, forming an air hole 5 equipped with the adsorption layer 7 and an inspection gas flow hole 9 equipped with a flow rate limiting function in the airtight housing 2, and arranging the inspection gas flow hole 9 of the gas sensor 1 and at least part of the air hole 5 in order from the lower side to the top side.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本願は家庭用ガス漏れ警報器等と
して使用されるガス警報器に関し、警報器ボックス内
に、検知対象ガス及び点検ガスに感応するガスセンサが
配設されるセンサ室とガスセンサ以外の作動機器が配設
される機器室とを備え、前述のセンサ室にガスが流通可
能なガス流通窓と点検時に点検ガスをセンサ室内へ供給
するための点検ガス供給窓とを備えたガス警報器に関す
る。ここで、このようなガス警報器は、その使用上、特
にアルコール蒸気等による誤報を防ぐ機能を有するガス
センサが使用されるものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present application relates to a gas alarm used as a home gas leak alarm, etc., and a sensor chamber and a gas sensor in which a gas sensor sensitive to a gas to be detected and an inspection gas is arranged in an alarm box. Gas having a gas chamber through which a gas can flow in the sensor chamber and an inspection gas supply window for supplying inspection gas into the sensor chamber at the time of inspection. Regarding the alarm device. Here, in such a gas alarm device, a gas sensor having a function of preventing a false alarm due to alcohol vapor or the like is used in particular.

【0002】[0002]

【従来の技術】以下、点検ガスがアルコールガスである
場合を例に採って説明する。従来、このようなガス警報
器に採用されているガスセンサは、検知対象ガスを検知
するための通常検知状態において、低濃度のアルコール
により誤報を発するのを防止している。即ち、通常ガス
検知状態においては、最高2000ppm〜6000p
pm程度(前者の濃度は酒の燗をおこなう場合、後者の
濃度は料理中にアルコール蒸気を上げた場合)のアルコ
ールガスが、センサ近傍に移流して誤報を発する危険が
あるが、活性炭層等をセンサの通気孔の入口部に備え、
検知対象ガスのみを選択的に検知することができる構造
として、この誤報の問題を回避している。従って、この
吸着層により、検知対象ガスに対して妨害ガス(本来検
知されるべきでないが、ガス検知素子の特性上、このガ
スが検知素子に接触すると検知信号を出力してしまうも
の)として働くアルコールが、ガス検知素子に近接する
のを防止され、前述の問題が解消される。一方、家庭用
ガス警報器等(実質上は警報器に備えられたガスセン
サ)が正常に作動しているか否かを点検するために、意
図的に人体に無害なアルコールガス等を点検ガスとして
用い、通常1〜2ヶ月に一度ガスセンサに点検ガスを噴
射し、警報器を鳴動させて正常検知を確認している。こ
のような点検状態にあっては、例えば1%以上の高濃度
のアルコールガスがセンサ近傍へ供給される。
2. Description of the Related Art A case where an inspection gas is alcohol gas will be described below as an example. Conventionally, the gas sensor used in such a gas alarm device prevents false alarms due to low-concentration alcohol in a normal detection state for detecting a detection target gas. That is, in the normal gas detection state, the maximum is 2000 ppm to 6000 p.
Alcohol gas of about pm (the former concentration is when the sake is smoked, the latter concentration is when the alcohol vapor is raised during cooking), but there is a risk that the alcohol gas may flow to the vicinity of the sensor and give a false alarm, but the activated carbon layer, etc. At the inlet of the sensor vent,
The problem of this false alarm is avoided as a structure that can selectively detect only the gas to be detected. Therefore, this adsorption layer acts as an interfering gas with respect to the gas to be detected (which should not be detected originally, but due to the characteristics of the gas detection element, a detection signal is output when this gas contacts the detection element). Alcohol is prevented from approaching the gas sensing element, eliminating the aforementioned problems. On the other hand, in order to check whether or not the household gas alarm device (substantially the gas sensor provided in the alarm device) is operating normally, alcohol gas, which is harmless to the human body, is intentionally used as the inspection gas. Normally, the inspection gas is injected into the gas sensor once every one to two months, and the alarm is sounded to confirm normal detection. In such an inspection state, for example, alcohol gas having a high concentration of 1% or more is supplied to the vicinity of the sensor.

【0003】[0003]

【発明が解決しようとする課題】従って、上述のように
通気孔に吸着層を設けたガスセンサを採用するガス警報
器の点検に当たっては、該吸着層の吸着能を越える多量
の点検ガスを比較的長時間に亘って噴射供給しなけれ
ば、警報器は鳴動できない。さらに、一旦鳴動すると、
点検ガスの外部からの供給がおこなわれないにもかかわ
らず、吸着された点検ガスが吸着層から放出され、長時
間に亘ってガス漏れ警報器が鳴動を続けるという欠点が
ある。更にまた点検作業の終了後、ガス警報器が鳴動す
るまでに到らないまでも、センサのベース出力が高く維
持され、僅かな可燃性の雑ガスによっても鳴動する、即
ち誤報を発すると云う問題があった。
Therefore, when inspecting a gas alarm device that employs a gas sensor having an adsorption layer in the vent hole as described above, a large amount of inspection gas that exceeds the adsorption capacity of the adsorption layer is relatively used. The alarm cannot be activated unless the jet is supplied for a long time. Furthermore, once it rings,
Although the inspection gas is not supplied from the outside, the adsorbed inspection gas is released from the adsorption layer and the gas leak alarm continues to ring for a long time. Furthermore, even after the inspection work is completed, the base output of the sensor is kept high even before the gas alarm sounds, and a slight flammable combustible gas sounds, that is, a false alarm is generated. was there.

【0004】従って、本発明の目的は、点検ガスを吸着
する吸着層を備えているにもかかわらず、従来より低い
濃度の点検ガスの供給で、迅速かつ確実に鳴動するとと
もに、吸着層からの点検ガスの放出が比較的短時間にお
こなわれて、通常検知状態への復帰が早いガス警報器を
得ることにある。
Therefore, the object of the present invention is to provide an inspection layer having an adsorption layer for adsorbing the inspection gas. The purpose of the present invention is to obtain a gas alarm device in which the inspection gas is released in a relatively short time and the normal detection state is quickly returned to.

【0005】[0005]

【課題を解決するための手段】この目的を達成するため
の本願第1の発明のガス警報器の特徴構成は、これが、
ガス警報器を構成するに、気密性ハウジング内に、検知
対象ガス及び点検ガスに感応する金属酸化物半導体より
なるガス検知素子を備え、気密性ハウジングの外部と内
部との間でガスが流通可能な通気孔を備えると共に、通
気孔に点検ガスを吸着可能な吸着層を備え、通気孔とは
別の点検ガス流通孔を気密性ハウジングに設け、検知対
象ガスを検知するための通常ガス検知状態において、点
検ガス流通孔を流通するガスの流量を前記点検ガスに対
する前記検知対象ガスの選択性が増加する流量に制限す
る流量制限能を、点検ガス流通孔に備えたガスセンサを
採用し、ガスセンサの前記点検ガス流通孔と通気孔の少
なくとも一部とを、記載順に下部側から上部側の位置に
配置構成したことにある。さらに、本願第2の発明のガ
ス警報器の特徴構成は、ガス警報器を構成するに、気密
性ハウジング内に、検知対象ガス及び点検ガスに感応す
る金属酸化物半導体よりなるガス検知素子を備え、気密
性ハウジングの外部と内部との間でガスが流通可能な通
気孔を備えると共に、通気孔に点検ガスを吸着可能な吸
着層を備え、通気孔とは別の点検ガス流通孔を気密性ハ
ウジングに設けたガスセンサを採用し、点検ガス供給窓
と点検ガス流通孔との間を接続管で連通連結し、点検ガ
ス供給窓、接続管、点検ガス流通孔で形成される点検ガ
ス導入流路に、検知対象ガスを検知するための通常ガス
検知状態において、それに流通するガスの流量を点検ガ
スに対する検知対象ガスの選択性が増加する流量に制限
する流量制限能を備えさせてあることにある。さらに、
本願第3の発明の特徴構成は、ガスセンサとして、検知
対象ガス及び点検ガスに感応する金属酸化物半導体より
なるガス検知素子を気密性に構成されるセンサ室に備え
るとともに、ガス流通窓に点検ガスを吸着可能な吸着層
を備え、検知対象ガスを検知するための通常ガス検知状
態において点検ガス供給窓を実質閉状態に、且つ点検ガ
スを供給して点検をおこなう点検状態において点検ガス
供給窓を開状態に切り換える開閉手段を、点検ガス供給
窓に備えたことにある。そして、これらの作用・効果は
次の通りである。
The characteristic configuration of the gas alarm of the first invention of the present application for achieving this object is as follows.
In configuring the gas alarm, a gas detection element made of a metal oxide semiconductor that is sensitive to the gas to be detected and the inspection gas is provided in the airtight housing, and gas can flow between the outside and the inside of the airtight housing. In addition to various ventilation holes, the ventilation hole is equipped with an adsorption layer that can adsorb inspection gas, and an inspection gas flow hole separate from the ventilation hole is provided in the airtight housing to detect the target gas. In, the flow rate of the gas flowing through the inspection gas flow hole is limited to a flow rate at which the selectivity of the gas to be detected with respect to the inspection gas is increased, a gas sensor provided in the inspection gas flow hole is adopted, The inspection gas circulation hole and at least a part of the ventilation hole are arranged in the order from the lower side to the upper side. Further, in the characteristic configuration of the gas alarm device of the second invention of the present application, in the gas alarm device, a gas detection element made of a metal oxide semiconductor sensitive to the gas to be detected and the inspection gas is provided in the airtight housing. Airtightness: A ventilation hole that allows gas to flow between the outside and inside of the housing, and an adsorption layer that can adsorb inspection gas in the ventilation hole, and an inspection gas circulation hole that is separate from the ventilation hole is airtight. Adopting a gas sensor installed in the housing, connecting the inspection gas supply window and the inspection gas flow hole with a connecting pipe, and connecting the inspection gas supply window, connecting pipe, and inspection gas flow hole In addition, in the normal gas detection state for detecting the detection target gas, a flow rate limiting function is provided to limit the flow rate of the gas flowing through it to a flow rate at which the selectivity of the detection target gas with respect to the inspection gas increases. further,
As a characteristic configuration of the third invention of the present application, as a gas sensor, a gas detection element made of a metal oxide semiconductor sensitive to a gas to be detected and an inspection gas is provided in an airtight sensor chamber, and an inspection gas is provided in a gas flow window. Is equipped with an adsorption layer capable of adsorbing the inspection gas, the inspection gas supply window is substantially closed in the normal gas detection state for detecting the detection target gas, and the inspection gas supply window is opened in the inspection state in which the inspection gas is supplied for inspection. The inspection gas supply window is provided with opening / closing means for switching to the open state. The actions and effects of these are as follows.

【0006】[0006]

【作用】つまり、本願第1及び第2の発明のガス警報器
にあっては、ガスセンサ自身が気密性ハウジングを備
え、このハウジングに流量制限能を備えた点検ガス流通
孔(第2の発明の場合は点検ガス導入流路)と吸着層を
備えた通気孔とをともに備えたガスセンサが採用され
る。この構成のガスセンサは、通常のガス検知状態にお
いては、通気孔に関してはこれに備えられる吸着層の働
きにより、妨害ガスに対して検知対象ガスの選択性が確
保される。一方、点検ガス流通孔(第2の発明の場合は
点検ガス導入流路)を介する流路に関しては、この状態
で、流量制限能が付与されているため、拡散制限効果が
得られ、検知対象ガスに対する選択性が守られる。ここ
で、この拡散制限効果とは、複数のガス種において、夫
々のガスが有している燃焼速度に差があるため、気密性
ハウジング内へ供給される外気の量が規制されると、気
密性ハウジング内に配設されるガス検知素子に於けるガ
ス種による感度差(選択性)が得られることをいう。こ
の例の場合は、ガスセンサの他の構成を固定して、点検
ガス流通孔の大きさ(第2の発明の場合は点検ガス導入
流路の流路構成である流路径、流路長さ等)を特定すれ
ばこの効果が得られる(詳細については実施例中で説明
する)。即ち、この流路から点検ガスがハウジング内に
流入して、ガス警報器が点検ガスにより誤報を発するこ
とはない。次に、ガス警報器を点検する点検状態につい
て説明する。この点検状態においては、点検ガスを人為
的にもしくは自動的にガスセンサに供給するため、予め
点検ガス流通孔(第2の発明の場合は点検ガス導入流
路)に比較的高濃度の点検ガスを供給することとなる。
従って、この点検状態においては通常検知状態でガスセ
ンサに移流してくる点検ガスの濃度よりかなり高い濃度
の点検ガスを点検ガス流通孔(第2の発明の場合は点検
ガス導入流路)を介してハウジング内に供給することと
なり、結果的に、点検ガス流通孔(第2の発明の場合は
点検ガス導入流路)の流量制限能は発揮されず、点検ガ
スがガス検知素子近傍に移流して、感応する。従って、
吸着層に吸着されるべき点検ガス量を従来よりかなり低
い量に抑えたままでガス検知素子を作動させて点検をお
こなえるため、この点検作業は、迅速且つ点検ガス量を
比較的低濃度で済ませることができ、作動も確実なもの
とできる。一方、一旦点検が完了した後においても、吸
着層に吸着されている点検ガス量が低く抑えられている
ため、通常検知状態への復帰も早く、警報器が不要に鳴
動を続けることもない。そして、本願第1の発明の構成
の場合は、センサ室に於ける点検ガス流通孔と通気孔と
の位置関係が特定されているため、点検状態に於けるこ
のガスセンサ近傍の気流は、ガス室の下部域から点検ガ
ス流通孔を介してガスセンサ内へ流入するとともに、通
気孔を介してセンサ室の上部域へ抜けるものとなる。当
然この時、ガスセンサ内において、ガスはガス検知素子
の近傍へも移流し、これに感応する。従って、点検ガス
の吸着層への吸着、及びこれからの放出が迅速となり、
点検作業、及びこの作業の完了後のガス警報器の復帰
を、迅速且つ確実なものとすることができる。一方、本
願第2の発明の構成の場合は、点検ガス導入流路を設け
ることにより、確実に点検ガスをガスセンサ内に導ける
ため、少量のガスで確実な点検をおこなうことができ
る。さらに、本願第3の発明の場合は、上述の構成で説
明したガスセンサの気密性ハウジングの機能がセンサ室
自体に備わることとなる。従ってガス流通窓に吸着層
が、点検ガス供給窓に開閉手段が設けられる。そして、
通常ガス検知状態にあっては、前者に対しては吸着層に
より後者に対しては開閉手段を閉状態に維持することに
より、ガス警報器自体のガス選択性が確保される。一
方、点検状態においては、開閉手段を開状態として点検
ガスをセンサ室に供給することにより、点検がおこなえ
る。この場合、ガス検知素子が裸でセンサ室内に配設さ
れているため、点検ガスの検知は従来より早くすること
ができる。
That is, in the gas alarm device according to the first and second inventions of the present application, the gas sensor itself has an airtight housing, and the housing has an inspection gas passage hole having a flow rate limiting function (of the second invention. In this case, a gas sensor having both an inspection gas introduction flow path) and a vent having an adsorption layer is adopted. In the gas sensor of this configuration, in a normal gas detection state, the adsorption layer provided for the vent hole ensures the selectivity of the gas to be detected with respect to the interfering gas. On the other hand, regarding the flow path through the inspection gas flow hole (in the case of the second invention, the inspection gas introduction flow path), since the flow rate limiting ability is given in this state, the diffusion limiting effect is obtained, and the detection target Gas selectivity is preserved. Here, this diffusion limiting effect means that there is a difference in the combustion speed of each gas among a plurality of gas types, so if the amount of outside air supplied into the airtight housing is regulated, airtightness will be obtained. It means that a sensitivity difference (selectivity) depending on the gas species can be obtained in the gas detection element arranged in the flexible housing. In the case of this example, the other components of the gas sensor are fixed, and the size of the inspection gas flow hole (in the case of the second invention, the diameter of the inspection gas introducing passage, the passage diameter, the passage length, etc.). ) Is specified to obtain this effect (details will be described in Examples). That is, the inspection gas does not flow into the housing through this flow path, and the gas alarm does not give a false alarm due to the inspection gas. Next, the inspection state for inspecting the gas alarm will be described. In this inspection state, since the inspection gas is artificially or automatically supplied to the gas sensor, a relatively high concentration inspection gas is previously supplied to the inspection gas flow hole (in the second invention, the inspection gas introduction passage). Will be supplied.
Therefore, in this inspection state, the inspection gas having a concentration considerably higher than the concentration of the inspection gas advancing to the gas sensor in the normal detection state is passed through the inspection gas flow hole (in the case of the second invention, the inspection gas introduction flow path). As a result, the gas is supplied into the housing, and as a result, the flow rate limiting function of the inspection gas flow hole (in the case of the second invention, the inspection gas introduction flow path) is not exerted, and the inspection gas is admitted to the vicinity of the gas detection element. , To respond. Therefore,
Since the inspection can be performed by operating the gas detection element while the amount of inspection gas to be adsorbed in the adsorption layer is suppressed to a much lower amount than before, this inspection work can be done quickly and the inspection gas amount can be relatively low. The operation can be ensured. On the other hand, even after the inspection is completed once, the amount of the inspection gas adsorbed in the adsorption layer is kept low, so that the normal detection state is quickly returned, and the alarm does not continue to ring unnecessarily. Further, in the case of the configuration of the first invention of the present application, since the positional relationship between the inspection gas circulation hole and the ventilation hole in the sensor chamber is specified, the air flow in the vicinity of the gas sensor in the inspection state is The gas flows into the gas sensor from the lower area of the sensor chamber through the inspection gas circulation hole and exits to the upper area of the sensor chamber through the ventilation hole. Naturally, at this time, in the gas sensor, the gas also flows into the vicinity of the gas detection element and responds thereto. Therefore, the adsorption of the inspection gas to the adsorption layer and its release will be quick,
The inspection work and the return of the gas alarm device after the completion of this work can be made prompt and reliable. On the other hand, in the case of the configuration of the second invention of the present application, by providing the inspection gas introduction flow path, the inspection gas can be surely guided into the gas sensor, and therefore a reliable inspection can be performed with a small amount of gas. Further, in the case of the third invention of the present application, the function of the airtight housing of the gas sensor described in the above configuration is provided in the sensor chamber itself. Therefore, the adsorption layer is provided in the gas flow window, and the opening / closing means is provided in the inspection gas supply window. And
In the normal gas detection state, the gas selectivity of the gas alarm device itself is secured by maintaining the adsorption layer for the former and the opening / closing means for the latter in the closed state. On the other hand, in the inspection state, the inspection can be performed by opening the opening / closing means and supplying the inspection gas to the sensor chamber. In this case, since the gas detection element is arranged naked inside the sensor chamber, the inspection gas can be detected earlier than before.

【0007】[0007]

【発明の効果】従って、点検ガスを吸着する吸着層を備
えているにもかかわらず、従来より少量の点検ガスの供
給で、迅速かつ確実に鳴動するとともに、吸着層からの
点検ガスの放出が比較的短時間におこなわれて、通常検
知状態への復帰が早いガス警報器を得ることができた。
Therefore, even though the inspection layer is provided with an adsorption layer for adsorbing the inspection gas, a small amount of the inspection gas is supplied more quickly and reliably and the inspection gas is released from the adsorption layer. It was possible to obtain a gas alarm that was performed in a relatively short time and returned to the normal detection state quickly.

【0008】[0008]

【実施例】本願の実施例を図面に基づいて説明する。先
ず、本願のガス警報器10の構成について説明する。図
1には、このガス警報器10の警報器ボックス11内部
構成が示されており、このガス警報器10は台所等の壁
面に図面と上下方向と一致させて配置される。一方、図
2はガスセンサ1が配設されるセンサ室12の縦断面を
示している。図示するようにガス警報器10の警報器ボ
ックス11は、方形の箱型に形成されており、内部が、
ガスセンサ1が配設されるセンサ室12とその他の機器
13が配設される機器室14とに、隔壁15によって仕
切られている。そして、このセンサ室12に対して、警
報器ボックス11の表側と横部位で開口するガスの流通
窓16が設けられ、前述の点検ガス流通孔9の位置に対
応して、センサ室12の下部域に点検ガス供給窓17が
設けられている。一方、機器室14には、発声器18、
トランス19、電源制御機器20等が配設される。さら
に、ここに採用されるガスセンサ1は、後述するように
特別な構成の点検ガス流通孔9を、その気密性のハウジ
ングに備えており、この点検ガス流通孔9がセンサ室1
2の下部域にくるように配置されて使用される。従っ
て、点検ガス供給窓、ガスセンサの前記点検ガス流通孔
9及び通気孔の少なくとも一部とが、記載順に下部側か
ら上部側に位置したものとなり、この順に流路が形成さ
れる。
Embodiments of the present application will be described with reference to the drawings. First, the configuration of the gas alarm device 10 of the present application will be described. FIG. 1 shows an internal configuration of an alarm box 11 of the gas alarm 10. The gas alarm 10 is arranged on a wall surface of a kitchen or the like so as to be vertically aligned with the drawing. On the other hand, FIG. 2 shows a vertical cross section of the sensor chamber 12 in which the gas sensor 1 is arranged. As shown in the figure, the alarm box 11 of the gas alarm 10 is formed in a rectangular box shape, and the inside is
A sensor chamber 12 in which the gas sensor 1 is arranged and a device chamber 14 in which other devices 13 are arranged are partitioned by a partition wall 15. Then, a gas flow window 16 that opens on the front side and the lateral side of the alarm box 11 is provided in the sensor chamber 12, and the lower part of the sensor chamber 12 is provided corresponding to the position of the inspection gas flow hole 9 described above. An inspection gas supply window 17 is provided in the area. On the other hand, in the equipment room 14, a voice generator 18,
A transformer 19, a power supply control device 20, etc. are arranged. Further, the gas sensor 1 adopted here is provided with an inspection gas passage hole 9 having a special structure in its airtight housing as will be described later, and the inspection gas passage hole 9 is provided in the sensor chamber 1.
It is used by being placed so as to come to the lower area of 2. Therefore, the inspection gas supply window, the inspection gas flow hole 9 of the gas sensor, and at least a part of the ventilation hole are located from the lower side to the upper side in the order of description, and the flow path is formed in this order.

【0009】以下、上述のガスセンサ1の構成を先に説
明し、引き続いてガス警報器の作動状況に関して説明す
る。図3には本願のガスセンサ1の分解斜視図(イ)及
び組み立て状態の斜視図(ロ)が示されている。図示す
るように、このガスセンサ1は円筒形状のハウジング2
の内部に金属酸化物半導体よりなるガス検知素子3を備
えた構成のものであり、その頂部部位において、ハウジ
ング外部4aと内部4bとの間でガスが流通可能な通気
孔5が備えられている。そして、このハウジング2に対
して下部よりガス検知素子3を備えたセンサ基台6を挿
入することによりガスセンサ1が組立てられる。ここ
で、ハウジング2自体は気密性の材料で構成されてお
り、通気孔5、この通気孔5の全面に亘って設けられる
活性炭層7、防爆用構造材としての金網8を介してハウ
ジング外部4aとガス検知素子3の近傍とに亘ってガス
が流通する。さらに、前述の通気孔5とは別に、点検ガ
ス流通孔9が備えられている。この点検ガス流通孔9
は、前述の活性炭層7を介することなく金網8のみを介
して、ハウジング外部4aとガス検知素子3とに亘って
ガスが流通可能である。このガスセンサ1は、妨害ガス
であるとともに点検ガスとしてのアルコールガスに対し
て、検知対象ガスとしてのメタンガス等のガス選択性を
確保することができる。なお、活性炭は検知対象ガスで
あるメタン・水素・一酸化炭素ガスを吸着せず、アルコ
ール・ブタンガスを吸着するものである。
Hereinafter, the configuration of the above-described gas sensor 1 will be described first, and subsequently, the operating condition of the gas alarm will be described. FIG. 3 shows an exploded perspective view (a) and an assembled perspective view (b) of the gas sensor 1 of the present application. As shown, this gas sensor 1 has a cylindrical housing 2
Is provided with a gas detection element 3 made of a metal oxide semiconductor inside, and a vent hole 5 through which gas can flow between the housing outer part 4a and the inner part 4b is provided at the top part thereof. . Then, the gas sensor 1 is assembled by inserting the sensor base 6 having the gas detection element 3 into the housing 2 from below. Here, the housing 2 itself is made of an airtight material, and the housing exterior 4a is provided via a vent hole 5, an activated carbon layer 7 provided over the entire surface of the vent hole 5, and a wire mesh 8 as an explosion-proof structural material. The gas circulates between and near the gas detection element 3. Further, in addition to the above-mentioned ventilation hole 5, an inspection gas circulation hole 9 is provided. This inspection gas flow hole 9
The gas can flow between the housing exterior 4a and the gas detection element 3 via only the wire netting 8 without passing through the activated carbon layer 7 described above. The gas sensor 1 can secure gas selectivity of methane gas or the like as a detection target gas with respect to alcohol gas as an inspection gas as well as an interfering gas. In addition, activated carbon does not adsorb methane, hydrogen, and carbon monoxide gas, which are detection target gases, but adsorbs alcohol and butane gas.

【0010】以下さらに詳細に説明する。前述のハウジ
ング2の頂部には通気孔5が備えられている。このハウ
ジング2の内部で上端部側に吸着層としての活性炭層7
が設けられている。さらに下部側にガス検知素子3と防
爆構造材としての金網8が備えられており、これらはセ
ンサ基台6に取り付けられている。
Further details will be described below. A vent hole 5 is provided at the top of the housing 2 described above. An activated carbon layer 7 as an adsorption layer is provided on the upper end side inside the housing 2.
Is provided. Further, a gas detection element 3 and a wire mesh 8 as an explosion-proof structural material are provided on the lower side, and these are attached to the sensor base 6.

【0011】つぎに、前述の点検ガス流通孔9の構成に
ついて説明する。この流通孔9は特定の通気面積(断面
積)と特定の流路長さとを有し、流量制限能を備えて構
成されている。即ち、この流量制限能を備えることによ
り、メタンガスに対するガス検知状態(例えば素子温度
450℃程度で、通気孔を介してガスが流通できる状
態)において、この点検ガス流通孔9を流通するガス
(検知対象ガスと妨害ガスとの総量)の流量が、メタン
ガスのアルコールガスに対する選択性を確保できる流量
に制限されるように構成されている。
Next, the structure of the above-mentioned inspection gas flow hole 9 will be described. This flow hole 9 has a specific ventilation area (cross-sectional area) and a specific flow path length, and has a flow rate limiting capability. That is, by providing this flow rate limiting ability, in the gas detection state for methane gas (for example, at a device temperature of about 450 ° C., the gas can flow through the ventilation hole), the gas flowing through the inspection gas flow hole 9 (detection The total flow rate of the target gas and the interfering gas) is configured to be limited to a flow rate that can secure the selectivity of the methane gas to the alcohol gas.

【0012】ここで、流量制限能を備えることにより得
られる拡散制限効果とは、複数種のガスにおいて、夫々
のガスが有している燃焼速度に差があるため、ハウジン
グ2内へ供給される外気の量が規制されると、ハウジン
グ2内に配設されるガス検知素子3に於けるガス種によ
る感度差(選択性)が得られることを意味する。この原
理を簡単に、検知対象ガスとしてのメタンガスとこれに
対する妨害ガスとしてのアルコールガスの場合を例に採
って説明する。金属酸化物半導体をガス検知素子3とし
て用いる場合、通常、特定の検知温度範囲、センサの構
造条件で作動する。このような温度、構造に保たれたセ
ンサ1内にあるガス検知素子3にガス(複数のガスが混
在するガス)が接触すると、その一部が燃焼(酸化)す
る。そして、この燃焼の度合いはガス種によって異な
る。即ち、メタンガスの場合はアルコールガスと比較す
ると、これが少ない。ここでガス検知素子3の周囲雰囲
気(ハウジング内部4bにあるガス)への外気(ハウジ
ング外部4aのガス)の供給がある一定量以下に制限さ
れると、アルコールガスのように燃焼の速いガスの場合
にはガス検知素子3の周囲雰囲気(ハウジング内部4b
にあるガス)のガス濃度は上昇しない。何故なら、周囲
雰囲気に供給された外気中のガスはガス検知素子3によ
って燃焼され、かつつぎつぎと供給されるガスはその供
給量と釣合って燃焼に消費されるために、ガス検知素子
3の周囲雰囲気は低濃度に維持される。これに対してメ
タンガスのように燃焼速度の遅い、すなわち燃焼されに
くいガスの場合には、例えばハウジング外部4aの濃度
が上昇するとそれに応じてガス検知素子3の周囲雰囲気
へのガスの供給が増大し、これに対して燃焼による消費
は少ないために比較的短時間で周囲雰囲気は高濃度に達
する。従って、ガス種による検知温度、センサ構造起因
の選択性を、ガスの燃焼速度との関係から得ることが可
能であり、これはハウジング外部4aと内部4bとの間
の流通ガス流量によって決定される。この状態を定性的
に図4に示した。同図において横軸は点検ガス流通孔9
の孔径を、縦軸はガス種による感度を示している。結
果、孔径を制限するにしたがって、アルコールガスに対
するメタンガスの感度が比較的大きくなる孔径(流量
域)が存在していることが判る。即ち、孔径を直径
(0.5〜5mm)に設定する場合は、上述の点検ガス
流通孔9が流量制限能を備えることとなる。この流通流
量の調節は、孔径の設定、流路に沿った孔長さの設定等
によっても調節可能である。
Here, the diffusion limiting effect obtained by providing the flow rate limiting ability is supplied to the inside of the housing 2 because there is a difference in the burning speed of each gas among a plurality of types of gases. When the amount of outside air is regulated, it means that a sensitivity difference (selectivity) depending on the gas species in the gas detection element 3 arranged in the housing 2 can be obtained. This principle will be briefly described by taking as an example the case of a methane gas as a detection target gas and an alcohol gas as an interfering gas. When a metal oxide semiconductor is used as the gas sensing element 3, it normally operates within a specific sensing temperature range and sensor structural conditions. When a gas (a gas in which a plurality of gases are mixed) comes into contact with the gas detection element 3 in the sensor 1 maintained in such a temperature and structure, a part of the gas burns (oxidizes). And the degree of this combustion changes with gas types. That is, the amount of methane gas is less than that of alcohol gas. Here, if the supply of the outside air (gas in the housing outside 4a) to the atmosphere (gas inside the housing 4b) around the gas detection element 3 is limited to a certain amount or less, a gas that burns quickly such as alcohol gas is generated. In this case, the surrounding atmosphere of the gas detection element 3 (inside the housing 4b
Gas) does not increase. This is because the gas in the outside air supplied to the ambient atmosphere is burned by the gas detecting element 3, and the gas supplied one after another is consumed for combustion in proportion to the supply amount of the gas detecting element 3. The ambient atmosphere is maintained at a low concentration. On the other hand, in the case of a gas having a slow burning rate, that is, a gas that is difficult to burn, such as methane gas, for example, if the concentration of the housing outer portion 4a increases, the supply of gas to the atmosphere surrounding the gas detecting element 3 increases accordingly. On the other hand, since the consumption by combustion is small, the ambient atmosphere reaches a high concentration in a relatively short time. Therefore, it is possible to obtain the detection temperature due to the gas species and the selectivity due to the sensor structure from the relationship with the gas combustion speed, which is determined by the flow rate of the gas flowing between the housing outer part 4a and the inner part 4b. . This state is qualitatively shown in FIG. In the figure, the horizontal axis is the inspection gas flow hole 9
And the vertical axis represents the sensitivity depending on the gas species. As a result, it is found that there is a pore size (flow rate range) in which the sensitivity of methane gas to alcohol gas becomes relatively large as the pore size is limited. That is, when the hole diameter is set to a diameter (0.5 to 5 mm), the above-described inspection gas flow hole 9 has a flow rate limiting ability. The flow rate can be adjusted by setting the hole diameter, the hole length along the flow path, and the like.

【0013】以上に説明したガス警報器10の構成及び
ガスセンサ1の構造により、ガス警報器10は以下のよ
うに作動する。先ず、通常ガス検知状態における作動に
ついて説明すると、この状態においては、検知対象ガス
と妨害ガス(これが点検ガスともなっている)とが共
に、ガス流通窓16、点検ガス供給窓17より流入して
くる。そして、妨害ガスの濃度は一般に低い。従って、
ガスセンサ1の通気孔5を介する流路を流れるガスにお
いては、妨害ガスは活性炭層7に捕らえられて、これに
よりガス警報器10が誤報を発することはない。一方、
点検ガス流通孔17を介する流れに関しては、この流通
孔17が上述のように流量制限能を備えて構成されてい
るため、検知対象ガスの妨害ガス(点検ガス)に対する
選択性は十分に確保され、同様に誤報を発することはな
い。一般にこのような妨害ガスの濃度は、6000pp
m以下である。次に点検状態について説明する。ガス警
報器10の点検ガス供給窓17から点検ガスが供給され
ると、アルコールガスは、比較的比重が重いためセンサ
室12の下部域に滞留し、ガスセンサ1に設けられてい
る点検ガス流通孔9を介してハウジング2内に流入す
る。この状態においては、ハウジング2内のガスの流れ
は、内部がガス検知素子3により加熱されているため点
検ガス流通孔9がある下方より吸い込み、上方へ逃げて
行くこととなる。即ち、点検ガスはハウジング2内に入
り易く、また、活性炭層7が点検ガスの一部を吸着した
としても、点検ガス流通孔9から吸い込まれたガスによ
り外部へ洗い出され、クリーニングされることになり、
活性炭層7の吸着能や寿命が長期に保たれる。
With the configuration of the gas alarm device 10 and the structure of the gas sensor 1 described above, the gas alarm device 10 operates as follows. First, the operation in the normal gas detection state will be described. In this state, both the detection target gas and the interfering gas (which also serves as the inspection gas) flow in through the gas flow window 16 and the inspection gas supply window 17. . And the concentration of interfering gas is generally low. Therefore,
In the gas flowing through the flow path through the ventilation hole 5 of the gas sensor 1, the interfering gas is trapped by the activated carbon layer 7, and the gas alarm 10 does not give a false alarm. on the other hand,
Regarding the flow through the inspection gas flow hole 17, since the flow hole 17 is configured to have the flow rate limiting function as described above, the selectivity of the detection target gas with respect to the interfering gas (inspection gas) is sufficiently secured. , Likewise, will not give false alarms. Generally, the concentration of such interfering gas is 6000 pp
m or less. Next, the inspection state will be described. When the inspection gas is supplied from the inspection gas supply window 17 of the gas alarm device 10, the alcohol gas stays in the lower region of the sensor chamber 12 due to its relatively high specific gravity, and the inspection gas passage hole provided in the gas sensor 1 is provided. It flows into the housing 2 via 9. In this state, the gas flow in the housing 2 is sucked from below the inspection gas flow hole 9 and escapes upward because the inside is heated by the gas detection element 3. That is, the inspection gas easily enters the housing 2, and even if the activated carbon layer 7 adsorbs a part of the inspection gas, it should be washed out by the gas sucked from the inspection gas flow hole 9 to be cleaned. become,
The adsorption capacity and life of the activated carbon layer 7 are maintained for a long time.

【0014】以下、具体例について説明するとともに、
関連するガス選択性能の実験結果について説明する。 ガスセンサの構成 1 金属酸化物半導体のガス検知素子3 型式 金属酸化物半導体式 主成分 SnO2 半導体部 断面長径4mm×短径1mmの楕円で、
長さ1mm エチルアルコールとの感度比 ((エチルアルコール6000ppm)相当濃度) メタンガス 4000ppm ブタンガス 2500ppm 2 ハウジング2 筒外径 2.2mm 内容積 6.3ml 3 活性炭層付通気孔5 通気孔径 15mm 活性炭層厚 3mm 4 点検ガス流通孔9 通気孔径 1mm 5 金網8 100メッシュ、網2枚、0.2〜0.3mm厚
A specific example will be described below, and
The experimental results of the related gas selection performance will be described. Configuration of gas sensor 1 Metal oxide semiconductor gas detection element 3 Type Metal oxide semiconductor formula Main component SnO 2 semiconductor part Cross section 4 mm long x 1 mm short ellipse,
Length 1 mm Sensitivity ratio with ethyl alcohol (Equivalent concentration of ethyl alcohol 6000 ppm) Methane gas 4000 ppm Butane gas 2500 ppm 2 Housing 2 Cylinder outer diameter 2.2 mm Inner volume 6.3 ml 3 Vent hole with activated carbon layer 5 Vent hole diameter 15 mm Activated carbon layer thickness 3 mm 4 Inspection gas circulation hole 9 Vent hole diameter 1 mm 5 Wire mesh 8 100 mesh, 2 meshes, 0.2-0.3 mm thickness

【0015】本願のガス警報器の特性を以下に整理して
示す。 上記のガスセンサ 従来のガスセンサ 点検ガス流通孔 あり なし 点検ガス供給時の応答時間 1sec 8min 点検ガス供給停止からの 回復時間(鳴動停止時間) 5sec 50min 結果、点検動作の点で非常に好ましい結果が得られてい
ることがわかる。
The characteristics of the gas alarm device of the present application are summarized and shown below. Above gas sensor Conventional gas sensor With / without inspection gas flow hole Response time when supplying inspection gas 1sec 8min Recovery time from inspection gas supply stop (sound stop time) 5sec 50min Result, very favorable result in terms of inspection operation You can see that

【0016】従って、本願のガス警報器10によれば、
料理中に発生するアルコール濃度(6000ppm以
下)であれば、点検ガス流通孔9は検知対象ガスに充分
なガス選択性を付与することができるが、点検時には比
較的高濃度(1%以上)の点検ガスが噴射圧入されるた
め、ガス検知素子3の感応部周辺は高濃度となり、容易
に鳴動させることができる。そして、点検ガスが活性炭
層7を殆ど通過しないため、点検後の不都合は起こらな
い。結果、通常ガス検知状態、点検時ともに好適に作動
できるガス警報器を得ることができた。
Therefore, according to the gas alarm device 10 of the present application,
If the alcohol concentration generated during cooking (6000 ppm or less), the inspection gas flow hole 9 can give sufficient gas selectivity to the gas to be detected, but at the time of inspection, it has a relatively high concentration (1% or more). Since the inspection gas is injected and injected, the concentration around the sensitive portion of the gas detection element 3 becomes high, and the gas can be easily emitted. Since the inspection gas hardly passes through the activated carbon layer 7, no inconvenience occurs after the inspection. As a result, it was possible to obtain a gas alarm that can operate properly during normal gas detection and during inspection.

【0017】〔別実施例〕以下に本願の別実施例につい
て箇条書きする。 (イ) 上記の実施例においては、センサ室12内でガ
スセンサ1を横配置したが、これは図5に示すように立
て型配置してもよい。この場合もまた、点検ガス流通孔
9が通気孔5より下部に位置することが好ましく、点検
ガス供給窓17が前述の点検ガス流通孔9の近傍にある
ことが好ましい。 (ロ) 上記の実施例においては、ガスセンサ1に設け
られるる点検ガス流通孔9と、警報器ボックス11に設
けられる点検ガス供給窓17とを、センサ室12の下部
域に設け、両者間をこの条件以外に関しては独立な構成
としておいたが、例えば、ガスセンサ1に備えられる点
検ガス流通孔9の拡散制限効果を、ガスセンサ1、セン
サ室12の構成等を全体として考慮するほうが、好まし
い場合がある。このような例を以下に紹介する。 ロ−1 図6に示す例においては、点検ガス供給窓17と点検ガ
ス流通孔9とが、接続管50で連通連結されて構成され
る。よって、点検ガス供給窓17、接続管50、点検ガ
ス流通孔9に亘って点検ガス導入流路51が構成され
る。結果、上記の実施例よりもさらに、通常ガス検知状
態においては、この流路51を介しては妨害ガスのガス
センサ1内への妨害ガスの流入は起こり難くなり、一
方、点検時には、点検ガスがこの流路51に圧入される
ため、結果的に、適切な通常ガス検知状態、点検状態に
おける作動が確保できる。従って、この場合も、検知対
象ガスを検知するための通常ガス検知状態において、点
検ガス導入流路51を流通するガスの流量を点検ガスに
対する検知対象ガスの選択性が増加する流量に制限する
流量制限能を効果的に、この流路51に備えることがで
きる。 ロ−2 以上説明してきた例においては、ガスセンサ1はガス検
知素子3と気密性のハウジング2を備えて構成されてお
り、このハウジング2に点検ガス流通孔9を備える場合
に関して説明した。しかしながら、一般にガス警報器1
0においてはセンサ室12が独立して設けられているた
め、このセンサ室12自体に、これまで説明してきたガ
スセンサ1のハウジング2の機能を備えて構成すること
が可能である。即ち、図7に示す例においては、センサ
室12自体がガス流通窓16及び点検ガス供給窓17を
のぞいて気密性に構成される。そして、ハウジングを備
えない金属酸化物半導体よりなるガス検知素子3のみが
備えられるとともに、ガス流通窓16に点検ガスを吸着
可能な吸着層である活性炭層7が設けられている。そし
て、点検ガス供給窓17に、検知対象ガスを検知するた
めの通常ガス検知状態において点検ガス供給窓17を実
質閉状態に、点検ガスを供給して点検をおこなう点検状
態において点検ガス供給窓17を開状態に切り換える開
閉手段27が備えられている。ここで、この開閉手段2
7は、一定の点検ガスの供給状態(供給圧もしくは供給
量)が確保された場合に、開状態となる開閉弁から構成
する、もしくは上述のように、この点検ガス供給窓17
に拡散制限能を備えるように流量制限能を備えて構成し
てもよい。後者の場合は、センサ室12の容積等との関
係から、この窓17の形状が決定されることとなる。 (ハ) 上記の実施例においては、点検ガス流通孔9を
ハウジングの側部に設けたが、図8(イ)(ロ)に示す
ように、様々な位置に設けた場合も、選択性付与の本願
の目的を達することができる。図8(イ)に示すものは
ガスセンサのセンサ基台6部位に、図8(ロ)に示すも
のはガスセンサのセンサ基台6とハウジング2とで形成
される空間部位に、点検ガス流通孔9をそれぞれ設けた
ものである。ここで、これらの例の場合は、点検ガス流
通孔9とガス検知素子3との間に防爆用の金網を新たに
設ける必要がある。 (ニ) 上記の実施例においては、金属酸化物半導体式
ガス検知素子を用いたが、これに限定するものではな
く、金属酸化物半導体を用いたガス検知素子であれば、
型式を問わない。また、メタン、アルコールの各ガス間
での選択性を問題としたが、燃焼速度に差のあるガス間
であればいかなるガスに対しても本願の構成は適応でき
る。即ち、メタン・水素・一酸化炭素ガス、さらにこれ
らの一種以上のガスを混合した混合ガスにおいても、例
えばアルコールガスに対して選択性を持たせて適応可能
である。また、点検ガスとしてブタンを使用する場合も
適応できる。
[Other Embodiments] Other embodiments of the present application will be described below. (A) In the above-described embodiment, the gas sensor 1 is horizontally arranged in the sensor chamber 12, but it may be vertically arranged as shown in FIG. Also in this case, the inspection gas flow hole 9 is preferably located below the ventilation hole 5, and the inspection gas supply window 17 is preferably near the above-described inspection gas flow hole 9. (B) In the above embodiment, the inspection gas flow hole 9 provided in the gas sensor 1 and the inspection gas supply window 17 provided in the alarm box 11 are provided in the lower area of the sensor chamber 12, and the space between the two is provided. Other than this condition, the configuration is independent, but for example, it may be preferable to consider the diffusion limiting effect of the inspection gas flow hole 9 provided in the gas sensor 1 as a whole, such as the configuration of the gas sensor 1 and the sensor chamber 12. is there. An example of such a case is introduced below. B-1 In the example shown in FIG. 6, the inspection gas supply window 17 and the inspection gas flow hole 9 are configured to be connected and connected by a connecting pipe 50. Therefore, the inspection gas introduction flow path 51 is formed across the inspection gas supply window 17, the connecting pipe 50, and the inspection gas flow hole 9. As a result, in the normal gas detection state, it is more difficult for the disturbing gas to flow into the gas sensor 1 through the flow path 51 than in the above-described embodiment. Since it is press-fitted into the flow path 51, as a result, proper operation in the normal gas detection state and the inspection state can be ensured. Therefore, also in this case, in the normal gas detection state for detecting the detection target gas, the flow rate of the gas flowing through the inspection gas introduction flow path 51 is limited to the flow rate at which the selectivity of the detection target gas with respect to the inspection gas increases. The flow path 51 can be effectively provided with the limiting ability. B-2 In the example described above, the gas sensor 1 is configured to include the gas detection element 3 and the airtight housing 2, and the case where the housing 2 is provided with the inspection gas circulation hole 9 has been described. However, in general, the gas alarm 1
In 0, the sensor chamber 12 is provided independently, so that it is possible to configure the sensor chamber 12 itself with the function of the housing 2 of the gas sensor 1 described so far. That is, in the example shown in FIG. 7, the sensor chamber 12 itself is configured to be airtight except for the gas flow window 16 and the inspection gas supply window 17. Further, only the gas detection element 3 made of a metal oxide semiconductor without a housing is provided, and the gas distribution window 16 is provided with an activated carbon layer 7 which is an adsorption layer capable of adsorbing the inspection gas. Then, in the inspection gas supply window 17, the inspection gas supply window 17 is substantially closed in the normal gas detection state for detecting the detection target gas, and the inspection gas supply window 17 is supplied in the inspection state in which the inspection gas is supplied and the inspection is performed. An opening / closing means 27 for switching the open state to the open state is provided. Here, this opening / closing means 2
7 is composed of an on-off valve that is opened when a constant inspection gas supply state (supply pressure or supply amount) is secured, or as described above, this inspection gas supply window 17
It may be configured to have a flow rate limiting ability so as to have a diffusion limiting ability. In the latter case, the shape of the window 17 will be determined from the relationship with the volume of the sensor chamber 12 and the like. (C) In the above embodiment, the inspection gas flow hole 9 is provided on the side portion of the housing. However, as shown in FIGS. 8 (a) and 8 (b), it is possible to provide selectivity even at various positions. The object of the present application can be achieved. What is shown in FIG. 8 (a) is in the sensor base 6 part of the gas sensor, and what is shown in FIG. Are provided respectively. Here, in the case of these examples, it is necessary to newly provide an explosion-proof wire mesh between the inspection gas flow hole 9 and the gas detection element 3. (D) In the above embodiments, the metal oxide semiconductor gas sensing element was used, but the gas sensing element using the metal oxide semiconductor is not limited to this.
The model does not matter. Further, although the selectivity between each gas of methane and alcohol has been a problem, the configuration of the present application can be applied to any gas as long as it has a difference in burning rate. That is, methane / hydrogen / carbon monoxide gas, or even a mixed gas of one or more of these gases can be applied with selectivity to, for example, alcohol gas. It can also be applied when butane is used as the inspection gas.

【0018】また、特許請求の範囲の項に図面との対照
を便利にするために符号を記すが、該記入により本発明
は添付図面の構成に限定されるものではない。
Further, although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the structures of the accompanying drawings by the entry.

【図面の簡単な説明】[Brief description of drawings]

【図1】ガスセンサを内装したガス警報器の内部構成を
示す図
FIG. 1 is a diagram showing an internal configuration of a gas alarm device incorporating a gas sensor.

【図2】ガスセンサを内装したセンサ室の縦断面図FIG. 2 is a vertical cross-sectional view of a sensor chamber containing a gas sensor.

【図3】ガスセンサの分解斜視図及び組立て状態を示す
FIG. 3 is an exploded perspective view of the gas sensor and a view showing an assembled state.

【図4】各種ガスに関するセンサの感度を示す図FIG. 4 is a diagram showing the sensitivity of the sensor for various gases.

【図5】センサ室内に於けるガスセンサの別配設例を示
す図
FIG. 5 is a diagram showing another arrangement example of the gas sensor in the sensor chamber.

【図6】点検ガス供給窓と点検ガス流通孔との間に接続
管を備えた別実施例を示す図
FIG. 6 is a view showing another embodiment in which a connecting pipe is provided between the inspection gas supply window and the inspection gas flow hole.

【図7】ガス流通窓に吸着層を備えた別実施例の構成を
示す図
FIG. 7 is a diagram showing the configuration of another embodiment in which an adsorption layer is provided in the gas flow window.

【図8】ガスセンサの別実施例を示す図FIG. 8 is a diagram showing another embodiment of the gas sensor.

【符号の説明】[Explanation of symbols]

1 ガスセンサ 2 ハウジング 3 ガス検知素子 4a ハウジング外部 4b ハウジング内部 5 通気孔 7 吸着層 9 点検ガス流通孔 10 ガス警報器 11 警報器ボックス 12 センサ室 13 作動機器 14 機器室 16 ガス流通窓 17 点検ガス供給窓 50 接続管 51 点検ガス導入流路 27 開閉手段 1 Gas Sensor 2 Housing 3 Gas Detection Element 4a Housing Outside 4b Housing Inside 5 Vent Hole 7 Adsorption Layer 9 Inspection Gas Distribution Hole 10 Gas Alarm 11 Alarm Box 12 Sensor Room 13 Working Room 14 Equipment Room 16 Gas Distribution Window 17 Inspection Gas Supply Window 50 Connection pipe 51 Inspection gas introduction flow path 27 Opening / closing means

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成6年11月9日[Submission date] November 9, 1994

【手続補正1】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】0014[Correction target item name] 0014

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【0014】以下、具体例について説明するとともに、
関連するガス選択性能の実験結果について説明する。 ガスセンサの構成 1 金属酸化物半導体のガス検知素子3 型式 金属酸化物半導体式 主成分 SnO2 半導体部 寸法 4×1.5×1mm エチルアルコールとの感度比 ((エチルアルコール6000ppm)相当濃度) メタンガス 4000ppm ブタンガス 2500ppm 2 ハウジング2 筒外径 21mm 内容積 7.5ml 3 活性炭層付通気孔5 通気孔径 1mm 活性炭層厚 3mm 4 点検ガス流通孔9 通気孔径 1mm 5 金網8 100メッシュ、網2枚、0.2〜0.3mm厚
A specific example will be described below, and
The experimental results of the related gas selection performance will be described. Configuration of gas sensor 1 Gas detection element of metal oxide semiconductor 3 Type metal oxide semiconductor type Main component SnO 2 Semiconductor part size 4 × 1.5 × 1 mm Sensitivity ratio with ethyl alcohol (Equivalent concentration of ethyl alcohol 6000 ppm) Methane gas 4000 ppm butane 2500 ppm 2 housing 2 cylinder OD 21 mm inner volume 7.5 ml 3 activated carbon layer with ventilation holes 5 the ventilation hole diameter 1 4 mm activated carbon layer thickness 3 mm 4 inspection gas distributing holes 9 vent hole diameter 1 mm 5 wire net 8 100 mesh, two halftone , 0.2-0.3 mm thickness

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 警報器ボックス(11)内に、検知対象
ガス及び点検ガスに感応するガスセンサ(1)が配設さ
れるセンサ室(12)と前記ガスセンサ(1)以外の作
動機器(13)が配設される機器室(14)とを備え、
前記センサ室(12)にガスが流通可能なガス流通窓
(16)と点検時に前記点検ガスを前記センサ室(1
2)内へ供給するための点検ガス供給窓(17)とを備
えたガス警報器であって、 前記ガス警報器を構成するに、気密性ハウジング(2)
内に、前記検知対象ガス及び前記点検ガスに感応する金
属酸化物半導体よりなるガス検知素子(3)を備え、前
記気密性ハウジング(2)の外部(4a)と内部(4
b)との間でガスが流通可能な通気孔(5)を備えると
共に、前記通気孔(5)に前記点検ガスを吸着可能な吸
着層(7)を備え、前記通気孔(5)とは別の点検ガス
流通孔(9)を前記気密性ハウジング(2)に設け、 前記検知対象ガスを検知するための通常ガス検知状態に
おいて、前記点検ガス流通孔(9)を流通するガスの流
量を前記点検ガスに対する前記検知対象ガスの選択性が
増加する流量に制限する流量制限能を、前記点検ガス流
通孔(9)に備えたガスセンサ(1)を採用し、 前記ガスセンサ(1)の前記点検ガス流通孔(9)と前
記通気孔(5)の少なくとも一部とを、記載順に下部側
から上部側の位置に配置構成したガス警報器。
1. A sensor chamber (12) in which a gas sensor (1) sensitive to a gas to be detected and an inspection gas is disposed in an alarm box (11) and an operating device (13) other than the gas sensor (1). And an equipment room (14) in which
A gas flow window (16) through which gas can flow through the sensor chamber (12) and the inspection gas during inspection
2) A gas alarm provided with an inspection gas supply window (17) for supplying the gas into the interior, wherein the gas alarm comprises an airtight housing (2).
A gas detection element (3) made of a metal oxide semiconductor, which is sensitive to the detection target gas and the inspection gas, is provided therein, and the outside (4a) and the inside (4) of the airtight housing (2) are provided.
b) is provided with a vent hole (5) through which gas can flow, and the vent hole (5) is provided with an adsorption layer (7) capable of adsorbing the inspection gas, and the vent hole (5) is Another inspection gas passage hole (9) is provided in the airtight housing (2), and in the normal gas detection state for detecting the detection target gas, the flow rate of the gas flowing through the inspection gas passage hole (9) is changed. The gas sensor (1) provided in the inspection gas flow hole (9) is used to limit the flow rate of the gas to be detected with respect to the inspection gas to a flow rate that increases the selectivity, and the inspection of the gas sensor (1) is performed. A gas alarm in which the gas flow hole (9) and at least a part of the vent hole (5) are arranged in the order from the lower side to the upper side.
【請求項2】 警報器ボックス(11)内に、検知対象
ガス及び点検ガスに感応するガスセンサ(1)が配設さ
れるセンサ室(12)と前記ガスセンサ(1)以外の作
動機器(13)が配設される機器室(14)とを備え、
前記センサ室(12)にガスが流通可能なガス流通窓
(16)と点検時に前記点検ガスを前記センサ室(1
2)内へ供給するための点検ガス供給窓(17)とを備
えたガス警報器であって、 前記ガス警報器を構成するに、気密性ハウジング(2)
内に、前記検知対象ガス及び前記点検ガスに感応する金
属酸化物半導体よりなるガス検知素子(3)を備え、前
記気密性ハウジング(2)の外部(4a)と内部(4
b)との間でガスが流通可能な通気孔(5)を備えると
共に、前記通気孔(5)に前記点検ガスを吸着可能な吸
着層(7)を備え、前記通気孔(5)とは別の点検ガス
流通孔(9)を前記気密性ハウジング(2)に設けたガ
スセンサ(1)を採用し、 前記点検ガス供給窓(17)と前記点検ガス流通孔
(9)との間を接続管(50)で連通連結し、前記点検
ガス供給窓(17)、前記接続管(50)、前記点検ガ
ス流通孔(9)で形成される点検ガス導入流路(51)
に、前記検知対象ガスを検知するための通常ガス検知状
態において、それに流通するガスの流量を前記点検ガス
に対する前記検知対象ガスの選択性が増加する流量に制
限する流量制限能を備えさせてあるガス警報器。
2. A sensor chamber (12) in which a gas sensor (1) sensitive to a gas to be detected and an inspection gas is disposed in an alarm box (11), and an operating device (13) other than the gas sensor (1). And an equipment room (14) in which
A gas flow window (16) through which gas can flow through the sensor chamber (12) and the inspection gas during inspection
2) A gas alarm provided with an inspection gas supply window (17) for supplying the gas into the interior, wherein the gas alarm comprises an airtight housing (2).
A gas detection element (3) made of a metal oxide semiconductor, which is sensitive to the detection target gas and the inspection gas, is provided therein, and the outside (4a) and the inside (4) of the airtight housing (2) are provided.
b) is provided with a vent hole (5) through which gas can flow, and the vent hole (5) is provided with an adsorption layer (7) capable of adsorbing the inspection gas, and the vent hole (5) is A gas sensor (1) having another inspection gas passage hole (9) provided in the airtight housing (2) is adopted, and the inspection gas supply window (17) and the inspection gas passage hole (9) are connected. A check gas introduction flow path (51) formed by the check gas supply window (17), the connecting pipe (50), and the check gas flow hole (9), which are connected to each other by a pipe (50).
In the normal gas detection state for detecting the detection target gas, a flow rate limiting ability is provided to limit the flow rate of the gas flowing therethrough to a flow rate at which the selectivity of the detection target gas with respect to the inspection gas increases. Gas alarm.
【請求項3】 警報器ボックス(11)内に、検知対象
ガス及び点検ガスに感応するガスセンサが配設されるセ
ンサ室(12)と前記ガスセンサ以外の作動機器(1
3)が配設される機器室(14)とを備え、前記センサ
室(12)にガスが流通可能なガス流通窓(16)と点
検時に前記点検ガスを前記センサ室(12)内へ供給す
るための点検ガス供給窓(17)とを備えたガス警報器
であって、 前記ガス警報器を構成するに、前記検知対象ガス及び前
記点検ガスに感応する金属酸化物半導体よりなるガス検
知素子(3)を、気密性に構成された前記センサ室(1
2)内に備えるとともに、前記ガス流通窓(16)に前
記点検ガスを吸着可能な吸着層(7)を備え、 前記検知対象ガスを検知するための通常ガス検知状態に
おいて前記点検ガス供給窓(17)を実質閉状態に、且
つ前記点検ガスを供給して点検をおこなう点検状態にお
いて前記点検ガス供給窓(17)を開状態に切り換える
開閉手段(27)を、前記点検ガス供給窓(17)に備
えたガス警報器。
3. A sensor chamber (12) in which a gas sensor sensitive to a gas to be detected and an inspection gas is arranged in an alarm box (11), and an operating device (1) other than the gas sensor.
3) is provided in an equipment room (14), and a gas flow window (16) through which gas can flow through the sensor room (12) and the inspection gas is supplied into the sensor room (12) at the time of inspection. A gas alarm device having an inspection gas supply window (17) for operating the gas alarm device, the gas alarm device comprising a metal oxide semiconductor sensitive to the gas to be detected and the inspection gas. (3) is the airtight sensor chamber (1
2) and an adsorption layer (7) capable of adsorbing the inspection gas in the gas flow window (16), and the inspection gas supply window (in the normal gas detection state for detecting the detection target gas). An opening / closing means (27) for switching the inspection gas supply window (17) to an open state in an inspection state in which the inspection gas is supplied by supplying the inspection gas to the inspection gas supply window (17). Gas alarm in preparation for.
【請求項4】 前記開閉手段(27)が、前記検知対象
ガスを検知するための通常ガス検知状態において前記点
検ガス供給窓(17)を流通するガスの流量を前記点検
ガスに対する前記検知対象ガスの選択性が増加する流量
に制限する流量制限能を、前記点検ガス供給窓(17)
に付与する構造である請求項3に記載のガス警報器。
4. The opening / closing means (27) sets the flow rate of the gas flowing through the inspection gas supply window (17) in the normal gas detection state for detecting the detection target gas to the detection target gas with respect to the inspection gas. Of the check gas supply window (17) for limiting the flow rate to the flow rate at which the selectivity of the gas increases.
The gas alarm device according to claim 3, wherein the gas alarm device has a structure attached to the gas alarm device.
【請求項5】 前記検知対象ガスがメタン、水素、一酸
化炭素ガスであり、前記点検ガスがアルコールガス又は
ブタンガスである請求項1〜4のいずれか1項に記載の
ガス警報器。
5. The gas alarm device according to claim 1, wherein the gas to be detected is methane, hydrogen, or carbon monoxide gas, and the inspection gas is alcohol gas or butane gas.
JP21534793A 1993-08-31 1993-08-31 Gas alarm Expired - Lifetime JP3197401B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21534793A JP3197401B2 (en) 1993-08-31 1993-08-31 Gas alarm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21534793A JP3197401B2 (en) 1993-08-31 1993-08-31 Gas alarm

Publications (2)

Publication Number Publication Date
JPH0765276A true JPH0765276A (en) 1995-03-10
JP3197401B2 JP3197401B2 (en) 2001-08-13

Family

ID=16670801

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21534793A Expired - Lifetime JP3197401B2 (en) 1993-08-31 1993-08-31 Gas alarm

Country Status (1)

Country Link
JP (1) JP3197401B2 (en)

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CN117711143A (en) * 2023-12-23 2024-03-15 山东智慧燃气物联网技术有限公司 Remote monitoring gas alarm

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