JP4323005B2

JP4323005B2 - Gas sensor inspection tool, gas detector, and gas sensor inspection structure comprising these

Info

Publication number: JP4323005B2
Application number: JP15644699A
Authority: JP
Inventors: 光輝西田
Original assignee: New Cosmos Electric Co Ltd
Current assignee: New Cosmos Electric Co Ltd
Priority date: 1999-06-03
Filing date: 1999-06-03
Publication date: 2009-09-02
Anticipated expiration: 2019-06-03
Also published as: JP2000346760A

Description

【０００１】
【発明の属する技術分野】
本発明は、厨房、工場などに設置されるガス検知器、ガスセンサ点検具及びこれらにより構成されるガスセンサ点検構造に関するものである。
【０００２】
【従来の技術】
従来、この種のガス検知器２には、図５（ａ）に示すように、内蔵されたガスセンサ２３の作動状態を点検する際に、点検対象である前記ガスセンサ２３の周辺の雰囲気に、前記ガスセンサ２３の検知対象であるガス（以下「点検用ガス」という。）を導入するための点検孔２２が設けられていた。この点検孔２２は、前記ガスセンサ２３が収容された筐体２１の前面平板部に貫設されているものであって、前記点検孔２２の前記筐体２１表面側には、前記筐体２１の外表面から前記ガスセンサ２３が内蔵されている方向に向かって奥狭まりのテーパー状の係止部２８、又は図５（ｂ）に示すように前記筐体２１外面側が拡径した筒状の係止部２８が形成されている。
一方、前記ガスセンサ点検具３は、前記点検用ガスを収容するための収容部３４と、前記点検用ガスを前記ガス検知器２の点検孔２２に吐出供給するための吐出口３２が先端側に形成された筒状のノズル３１とで構成され、前記ノズル３１の基端側は前記収容部３４に前記点検用ガスを流通可能に連結されている。
前記ガスセンサ点検具３を用いて、前記ガス検知器２に内蔵されたガスセンサ２３の作動状態を点検する手順は、以下の通りである。
【０００３】
先ず、前記収容部３４に点検用ガスを充填する。詳述すると、ガスコンロ又はライター等の燃焼炎に前記ガスセンサ点検具３のノズル３１を挿入して、未燃焼ガスと燃焼ガスを含むガス（以下「燃焼ガス」という。）を吸引する。ここで、前記燃焼ガスを採取したばかりの前記ノズル３１の先端部は高温になっているので、前記点検孔２２の熱損傷を防止するために、前記ガスセンサ点検具３を一定時間放置する。
次いで、前記ノズル３１の先端部を冷ました後に、前記ガス検知器２の前記点検孔２２に、前記ノズル３１の先端を挿入する。このとき、前記ガス検知器２の点検孔２２に設けられた係止部２８に前記ノズル３１の先端が係合することによって前記ノズルの位置が定まる。このようにして、前記ノズル３１から前記点検孔２２を介して、前記ガス検知器２に備えられたガスセンサ２３の周辺の雰囲気に前記点検用ガスを供給するための流路が形成される。この状態で、前記収容部３４を押圧操作すれば、前記点検用ガスが前記ノズル３１の吐出口３２から前記点検孔２２を通過して、前記ガスセンサ２３の周辺の雰囲気に導入される。
そして、前記ガスセンサ２３の周辺の雰囲気に閾値以上の濃度の前記点検用ガスが導入されると前記ガスセンサ２３が作動し、これによって報知手段（図示省略）を駆動することが確認されると、前記ガス検知器２に備えられた前記ガスセンサ２３の作動状態が確認され、前記ノズル３１を前記ガス検知器２の点検孔２２から引き抜くことによって検査が終了する。
【０００４】
ここで、前記ガス検知器２は、空気より比重の小さなガス（例えば、天然ガス、水素ガス）を検知対象とする場合には高所に設置され、空気より比重の大きなガス（例えば、プロパンガス、塩素ガス）を検知対象とする場合には低所に設置されている。従って、前記ガスセンサ２３の作動状態を点検するために、前記ガスセンサ点検具３の使用者は、前記ガス検知器２が低位置に設置されているときには腕を斜め下方に差し出して、又、高位置に設置されているときには腕を斜め上方に差し出して、前記ノズル３１を前記点検孔２２に挿入することとなる。
【０００５】
【発明が解決しようとする課題】
図５（ｂ）に示すように、前記点検孔２２に設けられた筒状のガイドを有する係止部２８に前記ノズル３１の先端を挿入する際には、前記ノズル３１が前記係止部２８内の空間に収まるように、その挿入方向を正確に把握しておかなければならない。しかしながら、前記ガス検知器２の点検孔２２及び前記ガスセンサ点検具３のノズル３１は、その直径が数ミリ程度の微小な構造であり、その上、前述の如く、前記ガス検知器２の設置される位置は、前記ガスセンサ点検具３の使用者の足元又は頭上であるので、前記使用者が細かな作業を行ない難く、前記点検孔２２に、前記ノズル３１の挿入方向を正確に把握することは困難であった。
又、図５（ａ）に示すように、前記点検孔２２の係止部２８が奥狭まりのテーパー状に形成されていて前記ノズル３１の先端部との結合角度の制限が多少緩和された場合であっても、前記ノズル３１を斜め方向から前記点検孔２２に挿入すれば、前記ノズル３１の先端と前記係止部２８との接合面が密着しないので、すき間が生じて前記点検用ガスが外部に漏洩するという問題点があった。しかし、前記使用者が、前記ノズル３１の先端部が前記点検孔２２の係止部２８に正確に係止して前記点検用ガスが外部に漏れることなく前記ガスセンサ２３の周辺の雰囲気に導入され得る状態にあるか否かを確認することも困難であった。
このような事情から、前記ガスセンサ２３の点検作業を容易且つ迅速に行なうことが困難であるという問題点があった。
【０００６】
本発明の目的は、上記欠点に鑑み、前記ガスセンサの作動状態の点検を容易且つ迅速に行なうことができるガスセンサ点検具、ガス検知器及びこれらにより構成されるガスセンサ点検構造を提供することにある。
【０００７】
【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発明に係るガスセンサ点検具の特徴構成は、
ガス検知器の筐体に設けられた点検孔に点検用ガスを吐出供給するためのノズルを設けたガスセンサ点検具であって、少なくとも前記点検孔の入り口側が広径で奥狭まりの凹状球形であり、前記点検孔に前記ノズルを嵌入可能な係止部を前記点検孔周部に設け、前記点検孔の前記筐体内部に面した側の開口部に点検用ガスをガスセンサの雰囲気に導入するためのガイドを前記ガスセンサの方向へ延設し、前記筐体の表面側に面した前記点検孔の外周部に前記ノズルの挿入角度を規制する規制部を突設したガス検知器に用いられ、前記ノズルの軸心と前記点検孔の軸心とのなす角度に関わらず、前記ノズルの先端部と前記係止部とが密接した状態で、前記ノズルを前記点検孔に嵌入可能な凸状球面体の姿勢保持部を、前記ノズル先端部周囲に設けてある点にあり、
更に、前記姿勢保持部の表面に、前記点検用ガスの流路を貫設した位置決め突起を突設してあることが好ましい。
又、この目的を達成するための本発明に係るガス検知器の特徴構成は、
点検用ガスを吐出供給するガスセンサ点検具のノズルの先端部周囲に設けられた凸状球面体の姿勢保持部を嵌入させるための点検孔を筐体に設けてあるガス検知器であって、少なくとも前記点検孔の入り口側が広径で奥狭まりの凹状球形であり、前記点検孔の軸心と前記ノズルの軸心とのなす角度に関わらず、前記点検孔の周部と前記姿勢保持部とが密接した状態で前記点検孔に前記ノズルを嵌入可能な係止部を前記点検孔周部に設けてあり、前記点検孔の前記筐体内部に面した側の開口部には点検用ガスをガスセンサの雰囲気に導入するためのガイドが前記ガスセンサの方向へ延設されており、前記筐体の表面側に面した前記点検孔の外周部には前記ノズルの挿入角度を規制する規制部が突設されている点にあり、
更に、前記点検孔の周部が耐熱性素材により構成されていることが好ましい。
そして、これらの作用効果は、以下の通りである。
【０００８】
本願発明に係るガスセンサ点検具は、ガス検知器の筐体に設けられた点検孔に点検用ガスを吐出供給するためのノズルを設けたガスセンサ点検具であって、
少なくとも前記点検孔の入り口側が広径で奥狭まりの凹状球形であり、前記点検孔に前記ノズルを嵌入可能な係止部を前記点検孔周部に設け、前記点検孔の前記筐体内部に面した側の開口部に点検用ガスをガスセンサの雰囲気に導入するためのガイドを前記ガスセンサの方向へ延設し、前記筐体の表面側に面した前記点検孔の外周部に前記ノズルの挿入角度を規制する規制部を突設したガス検知器に用いられ、前記ノズルの軸心と前記点検孔の軸心とのなす角度に関わらず、前記ノズルの先端部と前記係止部とが密接した状態で、前記ノズルを前記点検孔に嵌入可能な凸状球面体の姿勢保持部を、前記ノズル先端部周囲に設けてある。
この姿勢保持部が前記筐体表面に露出した前記点検孔の縁端部又は前記係止部と当接するとき、前記点検孔の周部と前記姿勢保持部とは密接しているので、前記点検孔の内部空間と外部との間での気体の流通を遮断することが出来る。これによって、前記点検ガスを前記筐体内に吐出供給する際に、前記点検用ガスが前記筐体の外部に漏洩することを防止することができる。
又、前記ガスセンサ点検具のノズル先端部は、その軸心と前記点検孔の軸心とのなす角度に関わらず、前記点検孔の周部と密接した状態で嵌入可能に構成されているので、前記ノズルの先端部を前記点検孔に挿入する際の角度は、前記ノズルの吐出口が前記点検孔の内部空間に面していれば、特に制限されるものではない。従って、前記ガスセンサに前記点検用ガスを供給するための流路を容易に形成することが出来るので、容易且つ迅速に前記ガスセンサの作動状態を点検することが出来る。
【０００９】
具体的には、前記姿勢保持部が、前記ノズル先端部周囲に設けられた凸状球面体であると、前記ノズルの軸心と、前記点検孔の軸心とのなす角度に関わらず前記点検孔に当接する部分の形状は一定となる。そのため、前記ノズルの吐出口が前記点検孔の内部空間に面するように前記点検孔に前記姿勢保持部を嵌入させさえすれば、前記点検ガスが外部に漏洩しないように前記ガスセンサ周辺の雰囲気に前記点検用ガスを供給することができる。従って、前記ガス検知器に備えられた前記ガスセンサの作動状態の点検作業を効率よく行なうことができる。
【００１０】
更に、前記姿勢保持部の表面に、前記点検用ガスの流路を貫設した位置決め突起を突設して、前記位置決め突起を前記点検孔から前記筐体内部に挿入した上で、前記筐体の内側縁部に前記位置決め突起が当接するように前記姿勢保持部を前記点検孔の係止部に嵌入させると、前記ガスセンサの周辺に前記点検ガスを供給できる位置に前記ノズルの吐出口を誘導することができる。従って、確実に前記点検用ガスを前記ガスセンサの周辺の雰囲気に供給することができる。
【００１１】
又、本発明に係るガス検知器は、点検用ガスを吐出供給するガスセンサ点検具のノズルの先端部周囲に設けられた凸状球面体の姿勢保持部を嵌入させるための点検孔を筐体に設けてあるガス検知器であって、少なくとも前記点検孔の入り口側が広径で奥狭まりの凹状球形であり、前記点検孔の軸心と前記ノズルの軸心とのなす角度に関わらず、前記点検孔の周部と前記姿勢保持部とが密接した状態で前記点検孔に前記ノズルを嵌入可能な係止部を前記点検孔周部に設けてあり、前記点検孔の前記筐体内部に面した側の開口部には点検用ガスをガスセンサの雰囲気に導入するためのガイドが前記ガスセンサの方向へ延設されており、前記筐体の表面側に面した前記点検孔の外周部には前記ノズルの挿入角度を規制する規制部が突設されている。このように前記点検孔周部を構成してあると、前記ガスセンサ点検具のノズル先端部を容易に挿入することができるので、前記ガスセンサの点検作業を容易に行なうことが出来るガス検知器が得られる。又、点検用ガスをガスセンサの雰囲気に導入することができる。又、前記筐体の表面側に面した前記点検孔の外周部には、前記ノズルの挿入角度を規制する規制部が突設されているので、規制部にてノズルの挿入角度を規制することができる。
【００１２】
具体的には、前記係止部の入り口側が広径で奥狭まりの凹状球形に形成されていると、前記点検孔の軸心と前記ノズルの軸心とのなす角度に関わらず、前記ノズルの先端部は、前記係止部の同じ位置と接することとなる。従って、本発明に係るガスセンサ検知器の点検孔に、前記ノズルを挿入するときの角度は、前記ガスセンサの周辺の雰囲気に前記点検用ガスを供給可能でありさえすれば制限されない。
【００１３】
又、ガス検知器に設けられた点検孔に奥狭まりの凹状球形の係止部を形成してあると、前記姿勢保持部を備えたガスセンサ点検具を用いて前記ガスセンサの作動状態を点検する際に、前記点検孔の湾曲面に沿って前記姿勢保持部を摺動させるように前記ガスセンサ点検具を操作して、前記姿勢保持部を前記凹状球形係止部に密に嵌合させることは容易となる。そうすると、前記点検孔の内周面と前記姿勢保持部の外周面とが面同士で当接するために安定した構造となり、前記点検用ガスの外部への漏洩を起こり難くすることができる。
従って、従来のガスセンサ点検構造においては、ごく限られた挿入角度でしか前記点検孔に前記ノズルの吐出口を挿入することが出来なかったのに対して、本発明に係るセンサ点検具とガス検知器からなるガスセンサ点検構造では、方向性を厳密に考慮すること無く両者を当接することができる。そのため、前記ガスセンサに対して、容易且つ迅速に点検用ガスを供給することができるので、容易且つ迅速に前記ガスセンサの点検を行なうことができる。
【００１４】
【発明の実施の形態】
以下に、ノズル先端に球体、即ち凸状球面体の姿勢保持部を備えたガスセンサ点検具と、点検孔の入り口側が広径で奥狭まりの凹状球形であるガス検知器とでなるガスセンサ点検構造を例として、本発明の実施の形態を図面に基づいて説明する。
【００１５】
本発明に係るガス検知器２は、図１（ａ）に示すように、筐体２１にガスセンサ２３を内装していると共に、ガスセンサ点検具３のノズル３１が挿入される点検孔２２が形成されている。
この点検孔２２は、前記ガス検知器２の筐体２１の前面平板部に貫設されているものであって、前記点検孔２２の前記筐体２１表面側には、前記筐体２１の外表面から前記ガスセンサ２３が内蔵されている方向に向かって奥狭まりの凹状球形の係止部２５が略球体を嵌合可能に形成されている。そして、前記筐体２１の表面側に面した前記点検孔２２の外周部には、前記ガスセンサ点検具３に備えられたノズル３１の挿入角度を規制する規制部２６が突設されていると共に、前記点検孔２２の筐体２１内部に面した側の開口部には、前記点検用ガスを前記ガスセンサ２３の雰囲気に導入するためのガイド２７が、前記ガスセンサ２３の方向へ延設されている。
【００１６】
尚、前記筐体２１のうち、前記点検孔２２周部を除く部分は合成樹脂材料から構成され、前記点検孔２２の周部は、耐熱性材料から構成されている。ここで、前記耐熱性材料としては、鉄、銅、ニッケル、銀、金、チタン等の金属や、酸化アルミニウム、珪酸ナトリウム、ジルコニア、二酸化チタンなどのセラミックス等が挙げられる。
【００１７】
又、前記ガスセンサに点検用ガスを供給するガスセンサ点検具３は、図２に示すように、前記点検用ガスを収容するための収容部３４と、前記点検用ガスを前記ガス検知器２の点検孔２２に吐出供給するための吐出口３２を先端に形成してある筒状の耐熱性ノズル３１を有し、前記ノズル３１の基端側は前記収容部３４に前記点検用ガスを流通可能に連結されている。そして、図１（ｂ）に示すように、前記吐出口３２の周囲には、略球体の姿勢保持部３３が、前記ガス検知器２の前記点検孔２２の係止部２５に略密に嵌合可能に形成されている。
【００１８】
本発明に係るガスセンサ点検構造１にあっては、前記ガス検知器２に備えられたガスセンサ２３の作動状態を検査する際に、図１（ｂ）に示すように、前記ノズル３１に設けられた姿勢保持部３３と前記点検孔２２の係止部２５が密に嵌合することによって、前記点検用ガスを前記ガスセンサ点検具３の収納部３４に収納されたガスセンサ２３の周辺の雰囲気に導入するための流路を形成することとなる。
ここで、前記姿勢保持部３３と前記点検孔２２の係止部２５とは面で接しているため安定であり、一度嵌合すれば脱落し難い構造となっている。又、前記姿勢保持部３３は球体であるために、前記姿勢保持部３３を前記点検孔２２にどの方向から挿入しても、前記点検孔の係止部２５の周部に対応する円周形状で接するので方向性がない。又、前記点検孔２２の係止部２５も凹状球形に形成されているので、前記姿勢保持部の挿入角度を問わず、円周形状で接することとなる。従って、前記姿勢保持部３３を前記点検孔２２とを嵌合させることができる前記ノズル３１の挿入角度の自由度は、従来品と比べて大きくなっている。
又、前記姿勢保持部３３が前記係止部２５に密に内嵌しているか否か目視で確認することが困難な状況であっても、前記姿勢保持部３３を前記係止部２５に沿って摺動させたときの感覚で、前記姿勢保持部３３と前記点検孔２２との位置関係を推測することができる。
【００１９】
更に、本発明に係るガス検知器２の筐体２１表面にあっては、前記点検孔２２の周部に前記規制部２６を突設してある。ここで、前記規制部２６は、前記係止部２５と前記姿勢保持部３３が前記点検用ガスを前記ガスセンサ２３の周辺の雰囲気に導入可能な角度で嵌合するように、前記ノズル３１の挿入角度を当接規制するものである。
【００２０】
上記構成によれば、前記点検孔２２に前記姿勢保持部３３を嵌合させるときに、その挿入角度・位置を正確に把握する必要がなく、前記点検孔２２のおおよその位置を把握していれば、前記姿勢保持部３３の前記係止部２５への嵌入を手がかりに、前記ノズル３１を前記点検孔２２に略密に嵌合させることができる。例えば、前記ガス検知器２が厨房等の壁面の上方に設置されている場合には、図１（ｂ）に示すように、前記ガスセンサ点検具３の前記ノズル３１を上方に差し出して、前記ガス検知器２の係止部２５に前記姿勢保持部３３を嵌合させれば良い。又、前記ガス検知器２が厨房等の壁面の下方に設置されている場合には、図２に示すように、前記ガスセンサ点検具３の前記ノズル３１を下方に差し出して、前記ガス検知器２の係止部２５に前記姿勢保持部３３を嵌合させれば良い。
このようにして、本発明に係るガスセンサ点検構造１を採用したガス検知器２及びガスセンサ点検具３を用いると、従来品を用いた場合と比べて、容易且つ迅速に、前記ガスセンサ２３への点検用ガスの供給を行なうことができるので、容易且つ迅速に、前記ガスセンサの点検を行なうことができる。
【００２１】
〔別実施形態〕
以下に別実施形態を説明する。
前記姿勢保持部３３の形状として球体を例に挙げたが、前記姿勢保持部３３の形状は、前記点検孔２２と前記姿勢保持部３３との密接状態を確保するために、これらの接触面積を増加させることができれば良く、又、前記点検孔２２の軸心と前記姿勢保持部３３の軸心とがなす角度の方向性を緩和することが出来れば良い。従って、前記姿勢保持部の形状は、必ずしも球体である必要はないため、楕円球状であっても良く、又、前記点検孔２２と前記姿勢保持部３３とが嵌合する際、前記姿勢保持部３３の収容部に面した部分は両者の接合にあまり寄与しないので、その部分が欠落した球体、例えば、半球状であっても良い。
又、図３に示すように、前記ガスセンサ点検具３にあっては、前記姿勢保持部３３の表面に、前記点検用ガスの流路を貫設した位置決め突起３５を突設してあっても良い。前記位置決め突起３５を前記点検孔２２を通じて前記筐体２１内部に挿入した上で、前記筐体２１の内側縁部に前記位置決め突起３５が当接するように前記姿勢保持部３３を前記点検孔２２の係止部２５に嵌入させると、前記ガスセンサ２３の周辺に前記点検ガスを供給できる位置に前記ノズル３１の吐出口３２を誘導することができる。又、前記位置決め突起３５を設置する位置は、前記姿勢保持部３３が前記点検孔２２の縁端部と密に嵌合可能であって、且つ前記位置決め突起３５が前記点検孔２２の内側端部と当接可能な位置であれば良いので、前記ノズル３１の延長線上に限られない。
更に又、図４に示すように、ノズル３１の支持部を屈折して形成することによって、前記ガスセンサ点検具３のノズル３１の挿入角度を調節して、操作性を向上させることもできる。
【図面の簡単な説明】
【図１】本発明に係るガスセンサ点検構造の要部を表わす部分断面図
【図２】本発明に係るガスセンサ点検構造を表わす一部破断図
【図３】本発明に係るガスセンサ点検具の別実施形態を表わす部分断面図
【図４】本発明に係るガスセンサ点検具の別実施形態を表わす側面図
【図５】従来のガスセンサ点検構造を表わす一部破断図
【符号の説明】
１ガスセンサ点検構造
２ガス検知器
３ガスセンサ点検具
２１筐体
２２点検孔
２３ガスセンサ
２５係止部
３１ノズル
３３姿勢保持部
３５位置決め突起[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas detector, a gas sensor inspection tool installed in a kitchen, a factory, and the like, and a gas sensor inspection structure constituted by these.
[0002]
[Prior art]
Conventionally, in this type of gas detector 2, as shown in FIG. 5A, when the operation state of the built-in gas sensor 23 is inspected, the atmosphere around the gas sensor 23 to be inspected is An inspection hole 22 for introducing gas (hereinafter referred to as “inspection gas”) that is a detection target of the gas sensor 23 was provided. The inspection hole 22 is formed through a front plate portion of the casing 21 in which the gas sensor 23 is accommodated, and the inspection hole 22 has a surface of the casing 21 on the surface side of the casing 21. A tapered locking portion 28 that narrows from the outer surface toward the direction in which the gas sensor 23 is incorporated, or a cylindrical locking in which the outer surface side of the housing 21 is expanded in diameter as shown in FIG. A portion 28 is formed.
On the other hand, the gas sensor inspection tool 3 has an accommodating portion 34 for accommodating the inspection gas and a discharge port 32 for discharging the inspection gas to the inspection hole 22 of the gas detector 2 on the distal end side. It is comprised with the formed cylindrical nozzle 31, and the base end side of the said nozzle 31 is connected with the said accommodating part 34 so that the said inspection gas can be distribute | circulated.
The procedure for checking the operating state of the gas sensor 23 built in the gas detector 2 using the gas sensor checking tool 3 is as follows.
[0003]
First, the container 34 is filled with inspection gas. More specifically, the nozzle 31 of the gas sensor inspection tool 3 is inserted into a combustion flame such as a gas stove or lighter, and a gas containing unburned gas and combustion gas (hereinafter referred to as “combustion gas”) is sucked. Here, since the tip of the nozzle 31 just collected the combustion gas is at a high temperature, the gas sensor inspection tool 3 is left for a certain period of time in order to prevent thermal damage to the inspection hole 22.
Next, after the tip of the nozzle 31 is cooled, the tip of the nozzle 31 is inserted into the inspection hole 22 of the gas detector 2. At this time, the position of the nozzle is determined by engaging the tip of the nozzle 31 with a locking portion 28 provided in the inspection hole 22 of the gas detector 2. In this manner, a flow path for supplying the inspection gas to the atmosphere around the gas sensor 23 provided in the gas detector 2 from the nozzle 31 through the inspection hole 22 is formed. In this state, if the accommodating portion 34 is pressed, the inspection gas passes through the inspection hole 22 from the discharge port 32 of the nozzle 31 and is introduced into the atmosphere around the gas sensor 23.
Then, when the inspection gas having a concentration equal to or higher than the threshold is introduced into the atmosphere around the gas sensor 23, the gas sensor 23 is activated, thereby confirming that the notification means (not shown) is driven. The operating state of the gas sensor 23 provided in the gas detector 2 is confirmed, and the inspection is completed by pulling out the nozzle 31 from the inspection hole 22 of the gas detector 2.
[0004]
Here, the gas detector 2 is installed at a high place when a gas having a specific gravity smaller than air (for example, natural gas or hydrogen gas) is to be detected, and a gas having a higher specific gravity than air (for example, propane gas). In case of detecting chlorine gas), it is installed in a low place. Accordingly, in order to check the operating state of the gas sensor 23, the user of the gas sensor checking tool 3 pushes his arm diagonally downward when the gas detector 2 is installed at a low position, When installed, the nozzle 31 is inserted into the inspection hole 22 by pushing the arm obliquely upward.
[0005]
[Problems to be solved by the invention]
As shown in FIG. 5B, when the tip of the nozzle 31 is inserted into the locking portion 28 having a cylindrical guide provided in the inspection hole 22, the nozzle 31 is moved to the locking portion 28. The insertion direction must be accurately grasped so as to fit in the inner space. However, the inspection hole 22 of the gas detector 2 and the nozzle 31 of the gas sensor inspection tool 3 have a minute structure with a diameter of about several millimeters. In addition, as described above, the gas detector 2 is installed. Since the position of the gas sensor inspection tool 3 is at the foot or overhead of the user, it is difficult for the user to perform fine work, and it is possible to accurately grasp the insertion direction of the nozzle 31 in the inspection hole 22. It was difficult.
Further, as shown in FIG. 5A, when the locking portion 28 of the inspection hole 22 is formed in a narrow taper shape, the restriction on the coupling angle with the tip portion of the nozzle 31 is somewhat relaxed. Even so, if the nozzle 31 is inserted into the inspection hole 22 from an oblique direction, the joint surface between the tip of the nozzle 31 and the locking portion 28 does not come into close contact, so that a gap occurs and the inspection gas is generated. There was a problem of leaking outside. However, the user correctly introduces the inspection gas into the atmosphere around the gas sensor 23 without the leakage of the inspection gas to the outside because the tip of the nozzle 31 is accurately engaged with the engagement portion 28 of the inspection hole 22. It was also difficult to confirm whether it was in a state to obtain.
Under such circumstances, there has been a problem that it is difficult to perform the inspection work of the gas sensor 23 easily and quickly.
[0006]
In view of the above-described drawbacks, an object of the present invention is to provide a gas sensor inspection tool, a gas detector, and a gas sensor inspection structure including these, which can easily and quickly inspect the operation state of the gas sensor.
[0007]
[Means for Solving the Problems]
In order to achieve this object, the characteristic configuration of the gas sensor inspection tool according to the present invention is as follows:
A gas sensor inspection tool provided with a nozzle for discharging and supplying inspection gas to an inspection hole provided in a housing of a gas detector, wherein at least the entrance side of the inspection hole is a concave spherical shape having a wide diameter and a narrow depth. In order to introduce an inspection gas into the atmosphere of the gas sensor in the inspection hole peripheral portion provided with a locking portion into which the nozzle can be fitted into the inspection hole, the opening facing the inside of the casing of the inspection hole The gas sensor is extended in the direction of the gas sensor, and is used in a gas detector in which a restricting portion for restricting the insertion angle of the nozzle is provided on the outer peripheral portion of the inspection hole facing the surface side of the housing, Regardless of the angle formed by the axis of the nozzle and the axis of the inspection hole, a convex spherical body capable of fitting the nozzle into the inspection hole in a state where the tip of the nozzle and the locking portion are in close contact with each other. setting the posture holding portion, around the nozzle tip of the There is a point are,
Furthermore, it is preferable that a positioning projection that projects through the flow path of the inspection gas is provided on the surface of the posture holding portion.
Moreover, the characteristic configuration of the gas detector according to the present invention for achieving this object is as follows:
The inspection hole for fitting the posture holding portion of the convex spherical body provided an inspection gas to the distal end portion around the nozzle of the discharge for supplying the gas sensor inspection device A gas detector is provided in the housing, at least The entrance side of the inspection hole is a concave sphere with a wide diameter and a narrow depth, and the peripheral part of the inspection hole and the posture holding part are independent of the angle formed by the axis of the inspection hole and the axis of the nozzle. is provided with a possible engagement portion fitted into the nozzle before Symbol inspection hole in intimate contact with the state before Symbol inspection hole periphery, for the inspecting and the opening of the side facing the inside of the casing of the inspection hole A guide for introducing gas into the atmosphere of the gas sensor is extended in the direction of the gas sensor, and a restricting portion for restricting the insertion angle of the nozzle on the outer peripheral portion of the inspection hole facing the surface side of the housing Is in the point that is protruding ,
Furthermore, it is preferable that the peripheral portion of the inspection hole is made of a heat resistant material.
These functions and effects are as follows.
[0008]
The gas sensor inspection tool according to the present invention is a gas sensor inspection tool provided with a nozzle for discharging and supplying an inspection gas to an inspection hole provided in a housing of a gas detector,
At least the entrance side of the inspection hole is a concave sphere with a wide diameter and a narrow depth, and a locking portion capable of inserting the nozzle into the inspection hole is provided in the inspection hole peripheral portion, and the inspection hole has a surface inside the casing. A guide for introducing inspection gas into the atmosphere of the gas sensor is provided in the opening of the gas sensor, and the nozzle is inserted into the outer peripheral portion of the inspection hole facing the surface side of the housing. This is used in a gas detector that protrudes a regulating part that regulates the nozzle, and the tip part of the nozzle and the locking part are in close contact regardless of the angle formed by the axis of the nozzle and the axis of the inspection hole. In this state, a convex spherical body posture holding portion capable of fitting the nozzle into the inspection hole is provided around the tip of the nozzle.
When the posture holding portion comes into contact with the edge portion of the inspection hole exposed on the housing surface or the locking portion, the peripheral portion of the inspection hole and the posture holding portion are in close contact with each other. It is possible to block the gas flow between the internal space of the hole and the outside. Accordingly, when the inspection gas is discharged and supplied into the casing, the inspection gas can be prevented from leaking to the outside of the casing.
Further, the nozzle tip of the gas sensor inspection tool is configured to be fitted in close contact with the peripheral portion of the inspection hole, regardless of the angle formed between the axis of the gas sensor and the axis of the inspection hole. The angle at the time of inserting the tip of the nozzle into the inspection hole is not particularly limited as long as the discharge port of the nozzle faces the internal space of the inspection hole. Therefore, since the flow path for supplying the inspection gas to the gas sensor can be easily formed, the operating state of the gas sensor can be easily and quickly inspected.
[0009]
Specifically, when the posture holding part is a convex spherical body provided around the nozzle tip, the inspection is performed regardless of the angle formed between the axis of the nozzle and the axis of the inspection hole. The shape of the portion in contact with the hole is constant. Therefore, as long as the posture holding portion is inserted into the inspection hole so that the discharge port of the nozzle faces the internal space of the inspection hole, the atmosphere around the gas sensor is prevented from leaking to the outside. The inspection gas can be supplied. Therefore, it is possible to efficiently check the operation state of the gas sensor provided in the gas detector.
[0010]
Further, a positioning projection that penetrates the flow path of the inspection gas is provided on the surface of the posture holding portion, and the positioning projection is inserted into the housing from the inspection hole. When the posture holding portion is fitted into the inspection hole locking portion so that the positioning protrusion comes into contact with the inner edge of the gas sensor, the nozzle outlet is guided to a position where the inspection gas can be supplied to the periphery of the gas sensor. can do. Therefore, the inspection gas can be reliably supplied to the atmosphere around the gas sensor.
[0011]
In addition, the gas detector according to the present invention has an inspection hole in the casing for fitting the posture holding portion of the convex spherical body provided around the tip of the nozzle of the gas sensor inspection tool that discharges and supplies the inspection gas. A gas detector provided, wherein at least the entrance side of the inspection hole is a concave sphere having a wide diameter and a narrow depth, and the inspection is performed regardless of an angle formed by the axis of the inspection hole and the axis of the nozzle. is provided with a circumferential portion and the posture holding portion and the front Symbol inspection hole peripheral portion of the engaging portion fittable to the nozzle before Symbol inspection hole in intimate contact with the state of the hole, inside the housing of the inspection hole a guide for the opening of the facing side of introducing inspect gas atmosphere of the gas sensor is provided so as to extend in the direction of the gas sensor, an outer peripheral portion of the inspection hole facing the front side of the housing Is provided with a restricting portion for restricting the insertion angle of the nozzle . When the inspection hole peripheral portion is configured in this way, the nozzle tip of the gas sensor inspection tool can be easily inserted, so that a gas detector that can easily perform the inspection work of the gas sensor is obtained. It is done. Moreover, the inspection gas can be introduced into the atmosphere of the gas sensor. In addition, since a restricting portion for restricting the insertion angle of the nozzle protrudes from the outer peripheral portion of the inspection hole facing the front surface side of the housing, the restricting portion restricts the insertion angle of the nozzle. Can do.
[0012]
Specifically, when the entrance side of the locking portion is formed in a concave spherical shape having a wide diameter and a narrow depth, the nozzle of the nozzle regardless of the angle formed by the axis of the inspection hole and the axis of the nozzle. The tip end portion is in contact with the same position of the locking portion. Thus, the inspection hole of the gas sensor detector according to the present invention, the angle at the time of inserting the nozzle is not limited as long as Ri suppliable der the inspection gas atmosphere around the gas sensor.
[0013]
In addition, when the inspection hole provided in the gas detector is formed with a concave spherical locking part, the operation state of the gas sensor is checked using the gas sensor inspection tool provided with the posture holding part. In addition, it is easy to operate the gas sensor inspection tool so that the posture holding portion slides along the curved surface of the inspection hole so that the posture holding portion is closely fitted to the concave spherical locking portion. It becomes. Then, since the inner peripheral surface of the inspection hole and the outer peripheral surface of the posture holding portion are in contact with each other, a stable structure is obtained, and leakage of the inspection gas to the outside can be prevented.
Therefore, in the conventional gas sensor inspection structure, the nozzle outlet can be inserted into the inspection hole only with a very limited insertion angle, whereas the sensor inspection tool and the gas detection device according to the present invention can be used. In the gas sensor inspection structure comprising a vessel, both can be brought into contact without strictly considering the directionality. Therefore, since the inspection gas can be supplied to the gas sensor easily and quickly, the gas sensor can be easily and quickly inspected.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Below, a gas sensor inspection structure comprising a gas sensor inspection tool provided with a spherical or convex spherical body posture holding portion at the nozzle tip, and a gas detector having a concave spherical shape with a wide diameter and a narrow depth at the entrance side of the inspection hole. As an example, an embodiment of the present invention will be described with reference to the drawings.
[0015]
As shown in FIG. 1A, the gas detector 2 according to the present invention includes a gas sensor 23 in a housing 21 and an inspection hole 22 into which a nozzle 31 of the gas sensor inspection tool 3 is inserted. ing.
The inspection hole 22 is formed through the front plate portion of the casing 21 of the gas detector 2, and the inspection hole 22 has a surface on the surface side of the casing 21, and the outer side of the casing 21. A concave spherical locking portion 25 is formed so as to be able to fit a substantially spherical body from the surface toward the direction in which the gas sensor 23 is incorporated. A restricting portion 26 for restricting the insertion angle of the nozzle 31 provided in the gas sensor inspection tool 3 protrudes from the outer peripheral portion of the inspection hole 22 facing the surface side of the housing 21. A guide 27 for introducing the inspection gas into the atmosphere of the gas sensor 23 extends in the direction of the gas sensor 23 at the opening of the inspection hole 22 facing the inside of the housing 21.
[0016]
In addition, the part except the said inspection hole 22 circumference part of the said housing | casing 21 is comprised from the synthetic resin material, and the circumference part of the said inspection hole 22 is comprised from the heat resistant material. Here, examples of the heat-resistant material include metals such as iron, copper, nickel, silver, gold, and titanium, and ceramics such as aluminum oxide, sodium silicate, zirconia, and titanium dioxide.
[0017]
Further, as shown in FIG. 2, a gas sensor inspection tool 3 for supplying an inspection gas to the gas sensor includes an accommodating portion 34 for accommodating the inspection gas, and an inspection gas for the inspection of the gas detector 2. A cylindrical heat-resistant nozzle 31 having a discharge port 32 for discharging and supplying to the hole 22 is formed at the tip, and the base end side of the nozzle 31 can circulate the inspection gas into the housing portion 34. It is connected. As shown in FIG. 1 (b), a substantially spherical posture holding portion 33 is fitted around the discharge port 32 in a close-tight manner to the locking portion 25 of the inspection hole 22 of the gas detector 2. It is formed to be compatible.
[0018]
In the gas sensor inspection structure 1 according to the present invention, when the operating state of the gas sensor 23 provided in the gas detector 2 is inspected, as shown in FIG. The inspection holding gas is introduced into the atmosphere around the gas sensor 23 stored in the storage portion 34 of the gas sensor inspection tool 3 by closely fitting the posture holding portion 33 and the locking portion 25 of the inspection hole 22. Therefore, the flow path for this will be formed.
Here, the posture holding part 33 and the locking part 25 of the inspection hole 22 are in contact with each other on the surface, so that the posture holding part 33 and the locking part 25 are stable. Further, since the posture holding portion 33 is a sphere, no matter which direction the posture holding portion 33 is inserted into the inspection hole 22, a circumferential shape corresponding to the peripheral portion of the locking portion 25 of the inspection hole. There is no direction because it touches. Moreover, since the latching | locking part 25 of the said inspection hole 22 is also formed in the concave spherical shape, it will contact | connect in a circumferential shape irrespective of the insertion angle of the said attitude | position holding | maintenance part. Therefore, the degree of freedom of the insertion angle of the nozzle 31 that allows the posture holding portion 33 to be fitted with the inspection hole 22 is larger than that of the conventional product.
Even if it is difficult to visually confirm whether or not the posture holding portion 33 is closely fitted in the locking portion 25, the posture holding portion 33 is moved along the locking portion 25. The positional relationship between the posture holding part 33 and the inspection hole 22 can be estimated with the feeling when the user slides the sensor.
[0019]
Furthermore, on the surface of the casing 21 of the gas detector 2 according to the present invention, the restricting portion 26 protrudes from the peripheral portion of the inspection hole 22. Here, the restricting portion 26 is inserted into the nozzle 31 so that the locking portion 25 and the posture holding portion 33 are fitted at an angle at which the inspection gas can be introduced into the atmosphere around the gas sensor 23. The angle is restricted.
[0020]
According to the above configuration, when the posture holding portion 33 is fitted into the inspection hole 22, it is not necessary to accurately grasp the insertion angle and position, and the approximate position of the inspection hole 22 can be grasped. For example, the nozzle 31 can be fitted into the inspection hole 22 in a close-packed manner with the clue to fitting the posture holding portion 33 into the locking portion 25. For example, when the gas detector 2 is installed above a wall such as a kitchen, the nozzle 31 of the gas sensor inspection tool 3 is pushed upward as shown in FIG. What is necessary is just to make the said attitude | position holding part 33 fit in the latching | locking part 25 of the detector 2. FIG. When the gas detector 2 is installed below the wall surface of a kitchen or the like, as shown in FIG. 2, the nozzle 31 of the gas sensor inspection tool 3 is pushed out downward, and the gas detector 2 What is necessary is just to make the said attitude | position holding | maintenance part 33 fit to the latching | locking part 25 of this.
As described above, when the gas detector 2 and the gas sensor inspection tool 3 adopting the gas sensor inspection structure 1 according to the present invention are used, the inspection of the gas sensor 23 can be performed easily and quickly compared to the case of using the conventional product. Since the working gas can be supplied, the gas sensor can be inspected easily and quickly.
[0021]
[Another embodiment]
Another embodiment will be described below.
Although the sphere is taken as an example of the shape of the posture holding portion 33, the shape of the posture holding portion 33 is set so that the contact area between the inspection hole 22 and the posture holding portion 33 is close. It suffices if the directionality of the angle formed by the axis of the inspection hole 22 and the axis of the posture holding portion 33 can be relaxed. Accordingly, the shape of the posture holding portion does not necessarily need to be a sphere, and may be elliptical. When the inspection hole 22 and the posture holding portion 33 are fitted, the posture holding portion Since the portion facing the accommodating portion 33 does not contribute much to the joining of the two, it may be a sphere lacking that portion, for example, a hemisphere.
As shown in FIG. 3, in the gas sensor inspection tool 3, a positioning protrusion 35 penetrating the inspection gas flow path may be provided on the surface of the posture holding portion 33. good. After the positioning protrusion 35 is inserted into the housing 21 through the inspection hole 22, the posture holding portion 33 is moved to the inspection hole 22 so that the positioning protrusion 35 contacts the inner edge of the housing 21. When fitted into the locking portion 25, the discharge port 32 of the nozzle 31 can be guided to a position where the inspection gas can be supplied around the gas sensor 23. Further, the position of the positioning projection 35 is such that the posture holding portion 33 can be closely fitted to the edge end portion of the inspection hole 22, and the positioning projection 35 is the inner end portion of the inspection hole 22. The position is not limited to the extension line of the nozzle 31.
Furthermore, as shown in FIG. 4, by forming the support portion of the nozzle 31 by refraction, the insertion angle of the nozzle 31 of the gas sensor inspection tool 3 can be adjusted to improve operability.
[Brief description of the drawings]
FIG. 1 is a partial sectional view showing a main part of a gas sensor inspection structure according to the present invention. FIG. 2 is a partially broken view showing a gas sensor inspection structure according to the present invention. FIG. 4 is a side view showing another embodiment of a gas sensor inspection tool according to the present invention. FIG. 5 is a partially broken view showing a conventional gas sensor inspection structure.
DESCRIPTION OF SYMBOLS 1 Gas sensor check structure 2 Gas detector 3 Gas sensor check tool 21 Case 22 Inspection hole 23 Gas sensor 25 Locking part 31 Nozzle 33 Posture holding part 35 Positioning protrusion

Claims

A gas sensor inspection tool provided with a nozzle for discharging and supplying inspection gas to an inspection hole provided in a housing of a gas detector,
At least the entrance side of the inspection hole is a concave sphere with a wide diameter and a narrow depth, and a locking portion capable of inserting the nozzle into the inspection hole is provided in the inspection hole peripheral portion, and the inspection hole has a surface inside the casing. A guide for introducing inspection gas into the atmosphere of the gas sensor is provided in the opening of the gas sensor, and the nozzle is inserted into the outer peripheral portion of the inspection hole facing the surface side of the housing. Used for gas detectors with a restricting part that regulates
Regardless of the angle between the axis of the nozzle and the axis of the inspection hole, a convex spherical surface capable of fitting the nozzle into the inspection hole in a state where the tip of the nozzle and the locking portion are in close contact with each other. A gas sensor inspection tool in which a body posture holding part is provided around the tip of the nozzle.

The gas sensor inspection tool according to claim 1, wherein a positioning projection that projects through the flow path of the inspection gas is provided on the surface of the posture holding portion.

A gas detector provided with a check hole in a housing for fitting a posture holding portion of a convex spherical body provided around the tip of a nozzle of a gas sensor inspection tool for discharging and supplying a check gas,
At least the entrance side of the inspection hole is a concave spherical shape having a wide diameter and a narrow depth, and regardless of the angle formed by the axis of the inspection hole and the axis of the nozzle, the peripheral part of the inspection hole and the posture holding part close contact with is provided with a possible engagement portion fitted into the nozzle before Symbol inspection hole in a state before Symbol inspection hole peripheral portion, wherein the opening portion of the housing interior-facing side inspect the inspection hole is A guide for introducing the working gas into the atmosphere of the gas sensor is extended in the direction of the gas sensor, and a restriction for restricting the insertion angle of the nozzle in the outer peripheral portion of the inspection hole facing the surface side of the housing Gas detector with a protruding part .

The gas detector according to claim 3 , wherein a peripheral portion of the inspection hole is made of a heat resistant material.

A gas sensor inspection structure comprising the sensor inspection tool according to claim 1 and 2 and the gas detector according to claim 3 or 4 .