JP4408579B2

JP4408579B2 - Jig for inspection of defective pipe connections

Info

Publication number: JP4408579B2
Application number: JP2001009248A
Authority: JP
Inventors: 徳寿原田; 金次落合
Original assignee: Denso Air Systems Corp
Current assignee: Denso Air Systems Corp
Priority date: 2001-01-17
Filing date: 2001-01-17
Publication date: 2010-02-03
Anticipated expiration: 2021-01-17
Also published as: JP2002214067A

Description

【０００１】
【発明の属する技術分野】
本発明は、配管接続部におけるシール不良を検査する検査治具に関するもので、例えば、車両用空調装置の冷媒配管接続部に用いて好適である。
【０００２】
【従来の技術】
従来、特開平８−２７７９７６号公報において、車両用空調装置の冷媒配管接続構造が提案されている。この従来技術では、図８に示すように、雄側配管部材１０の先端部１０ａに、円周方向の凹溝１０ｂ、１０ｃを２つ軸方向に隣接して設け、この凹溝１０ｂ、１０ｃ内にゴム製のＯリング（環状弾性シール材）１１、１２を装着し、このＯリング１１、１２を装着した先端部１０ａを雌側配管部材２０の先端部２０ａの内側に同軸的に嵌合させている。
【０００３】
なお、両配管部材１０、２０はアルミニュウム等の金属にて成形されており、雄側配管部材１０には径外方へ突出する鍔状部１０ｄがバルジ加工により形成され、この鍔状部１０ｄに雌側配管部材２０の先端部２０ａが当接して、両配管部材１０、２０の軸方向の嵌合位置を決める。
【０００４】
そして、両配管部材１０、２０の嵌合部に装着される樹脂製の締結部材３０は、図示しないヒンジ結合部により開閉可能に係止される一対の半円筒状部材から構成され、図示の締結部材３０はそのうちの一方の半円筒状部材である。この一対の半円筒状締結部材３０を係止することにより、両配管部材１０、２０の嵌合部に径方向の締め付け力を加えて、両配管部材１０、２０の嵌合部を締結している。２つのＯリング１１、１２は、雄側配管部材１０の先端部１０ａの凹溝１０ｂ、１０ｃと、雌側配管部材２０の拡管先端部２０ａの内側面とに弾性的に圧着することにより、２重シール機能を発揮するようになっている。
【０００５】
【発明が解決しようとする課題】
ところで、万一、２つのＯリング１１、１２のうち、１つでも傷つき等の不良品が組み込まれると、上記２重シール機能を良好に発揮できない。そこで、配管接続構造の洩れ検査を実施して、Ｏリング１１、１２の傷つき等によるシール不良を発見する必要がある。
【０００６】
本発明は上記点に鑑みて、軸方向に並置された複数の弾性シール材によって多重シール機能を発揮する配管接続部において、弾性シール材の傷つき等によるシール不良を確実に発見できるようにすることを目的とする。
【０００７】
【課題を解決するための手段】
上記目的を達成するため、請求項１に記載の発明では、配管部材（１０）の先端部（１０ａ）の外周側に装着される環状弾性シール材（１１、１２）を複数個軸方向に並置する配管接続部におけるシール不良検査用治具であって、
配管部材（１０）の環状弾性シール材（１１、１２）の装着部分の外周側に嵌合するとともに環状弾性シール材（１１、１２）が弾性的に圧着する第１円筒状嵌合部材（４４）と、
配管部材（１０）から流入する検査流体を、複数の環状弾性シール材（１１、１２）の中間部位に導入する入口側連通路（４６ａ、４９、４４ｂ、５０、４４ｃ）と、
環状弾性シール材（１１、１２）のシール不良が発生したとき、環状弾性シール材（１１、１２）の装着部分を通過した検査流体を外部に放出する出口側連通路（４４ｄ，４４ｅ、５３）とを備えることを特徴とする。
【０００８】
これにより、複数の環状弾性シール材（１１、１２）のいずれか１つがシール不良であると、複数の環状弾性シール材（１１、１２）の中間部位に導入された検査流体がそのシール不良のシール材装着部分を通過して出口側連通路（４４ｄ，４４ｅ、５３）から外部に放出される。このため、検査流体の外部への放出を判定することにより、複数の環状弾性シール材（１１、１２）のいずれか１つのシール不良を確実に発見できる。
【０００９】
請求項２に記載の発明では、第１円筒状嵌合部材（４４）の内周側に軸方向に移動可能に嵌合する第２円筒状嵌合部材（４６）を有し、
入口側連通路（４６ａ、４９、４４ｂ、５０、４４ｃ）は、具体的には、配管部材（１０）から流入する検査流体が第２円筒状嵌合部材（４６）を内周側から外周側へ通過し、その後、検査流体が第１円筒状嵌合部材（４４）を内周側から外周側へ通過し、更に、検査流体が第１円筒状嵌合部材（４４）を外周側から内周側へ通過して複数の環状弾性シール材（１１、１２）の中間部位に到達するように構成する。
【００１０】
請求項２によると、第１円筒状嵌合部材（４４）の内周側に第２円筒状嵌合部材（４６）が軸方向に移動可能に嵌合しているから、例えば、検査終了後に、第２円筒状嵌合部材（４６）をばね力により軸方向に移動させ、その軸方向移動を利用して、配管部材（１０）を軸方向に押し戻すといった操作を行うことが可能となる。これにより、配管部材（１０）の検査終了後における取り出しが容易となる。
【００１１】
請求項３に記載の発明のように、出口側連通路は、具体的には、第１円筒状嵌合部材（４４）に形成され、環状弾性シール材（１１、１２）の一方（１２）の装着部分を通過した検査流体が流れる連通路（４４ｄ，４４ｅ）と、
第１円筒状嵌合部材（４４）と配管部材（１０）との嵌合隙間により形成され、環状弾性シール材（１１、１２）の他方（１１）の装着部分を通過した検査流体が流れる連通路（５３）とにより構成することができる。
【００１２】
請求項４に記載の発明では、請求項１ないし３のいずれか１つにおいて、配管部材（１０）は、環状弾性シール材（１１、１２）よりも配管中央側の部位に径外方へ突き出す鍔状部（１０ｄ）を有しており、
この鍔状部（１０ｄ）に当接して配管部材（１０）の挿入位置をロックするロック機構（４８）を備えることを特徴とする。
【００１３】
これにより、配管部材（１０）の鍔状部（１０ｄ）を利用して配管部材（１０）の挿入位置をロックする機能を容易に確保できる。
【００１４】
なお、上記各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものである。
【００１５】
【発明の実施の形態】
以下本発明を図に示す一実施形態に基づいて説明する。本実施形態は、前述の特開平８−２７７９７６号公報に記載されている、車両用空調装置の冷媒配管の接続部に適用した検査用治具に関する。
【００１６】
図１は配管部材１０を検査用治具４０に組み付ける前のフリー状態を示し、図２〜図６は配管部材１０を検査用治具４０に組み付けて、Ｏリングシール部を検査する過程を示す。配管部材１０は、前述の図８に示す雄側配管部材１０と同じものであり、先端部１０ａにＯリング（環状弾性シール材）１１、１２を装着する２つの凹溝１０ｂ、１０ｃを形成している。また、雄側配管部材１０にはＯリング装着部分よりも配管中央側（反先端側）の部位に径外方へ突出する断面Ｕ状の鍔状部１０ｄがバルジ加工により形成されている。
【００１７】
検査用治具４０は略円筒状の本体部４１を有し、この本体部４１の軸方向（図示の左右方向）の一端側（図示左側）の開口部４１ａは雄側配管部材１０の先端部１０ａ側を受け入れるためのものである。本体部４１の軸方向他端側（図示右側）の開口部４１ｂにはキャップ部材４２を一体に組み付けて、本体部４１の開口部４１ｂを閉じるようになっている。
【００１８】
キャップ部材４２の円筒状部４２ａを本体部４１の他端側開口部４１ｂの内周側に嵌合させ、その嵌合部にゴム製のＯリング（環状弾性シール材）４３を配置して、嵌合部の気密を維持するようになっている。
【００１９】
本体部４１およびキャップ部材４２の円筒状部４２ａの内周側には第１円筒状嵌合部材４４が軸方向に摺動可能に嵌合している。第１円筒状嵌合部材４４において、開口部４１ａ側の先端部４４ａは、図８の雌側配管部材２０の先端部２０ａに相当する部分であり、この先端部４４ａの内径は雄側配管部材１０の先端部１０ａの外径より微少量だけ大きくして、この先端部４４ａの内周側に雄側配管部材１０の先端部１０ａを挿入可能になっている。
【００２０】
第１円筒状嵌合部材４４とキャップ部材４２との間にコイルばね（ばね手段）４５を配置して、コイルばね４５のばね力により第１円筒状嵌合部材４４が開口部４１ａ側へ押圧されるようになっている。このため、図１のフリー状態においては、コイルばね４５のばね力により第１円筒状嵌合部材４４の外周鍔部４４ｇが本体部４１の内周側に形成されたストッパー面４１ｃに当接して停止している。
【００２１】
また、第１円筒状嵌合部材４４の内周側には第２円筒状嵌合部材４６が軸方向に摺動可能に嵌合している。この第２円筒状嵌合部材４６とキャップ部材４２との間にもコイルばね（ばね手段）４７を配置して、コイルばね４７のばね力により第２円筒状嵌合部材４６が開口部４１ａ側へ押圧されるようになっている。
【００２２】
このため、図１のフリー状態においては、コイルばね４７のばね力により第２円筒状嵌合部材４６が第１円筒状嵌合部材４４の内周側に形成されたストッパー面４４ｈに当接して停止している。
【００２３】
また、略円筒状の本体部４１の開口部４１ａ側の先端円筒部４１ｄには、雌側配管部材２０の先端部２０ａの挿入位置をロック（保持）するロック機構４８が備えられている。
【００２４】
このロック機構４８を具体的に説明すると、本体部４１の先端円筒部４１ｄの円周方向の複数箇所に円形の保持穴４１ｅを複数箇所等間隔に設けている。この保持穴４１ｅは先端円筒部４１ｄを径方向に貫通するとともに、この保持穴４１ｅの径寸法を先端円筒部４１の内周側ではロック機構４８のロックボール４８ａの径より小とし、且つ、保持穴４１ｅの径寸法を先端円筒部４１の外周側ではロック機構４８のロックボール４８ａの径より大としている。
【００２５】
そして、本体部４１の先端円筒部４１の外周面には作業者により手動操作される円筒状の操作部材（スリーブ）４８ｂが軸方向に移動可能に嵌合している。この操作部材４８ｂはコイルばね（ばね手段）４８ｃのばね力により開口部４１ａ側へ押圧されるようになっており、フリー状態では図示しないストッパーにより図１の位置に操作部材４８ｂが保持され、操作部材４８ｂによりロックボール４８ａを先端円筒部４１ｄの内周側へ押し下げている。
【００２６】
なお、上記の図示しないストッパーは次のように構成できる。例えば、本体部４１の先端円筒部４１ｄにおいて保持穴４１ｅより先端側の部位（保持穴４１ｅの図示左側の部位）に円周溝を設け、この円周溝にリング体（例えば、金属製のＣ状リング）を嵌合保持し、このリング体により操作部材４８ｂの図示左側への移動を規制する。
【００２７】
次に、配管部材１０の２つのＯリング１１、１２のシール不良を検査するための流体通路構成を説明すると、図５は配管部材１０を検査用治具４０内に挿入し、所定位置にロックした状態を示しており、検査流体としての空気が配管部材１０内を通して第２円筒状嵌合部材４６の内周側に導入されるようになっている。第２円筒状嵌合部材４６の軸方向の中間部位に、第２円筒状嵌合部材４６を径方向に貫通する穴からなる第１連通路４６ａが１箇所または複数箇所に開けてある。
【００２８】
これにより、導入空気は、第１連通路４６ａを通過して第２円筒状嵌合部材４６の外周側と第１円筒状嵌合部材４４の内周側との間の空間４９に流入するようになっている。第１円筒状嵌合部材４４においても、空間４９と連通する軸方向部位で径方向に貫通する穴からなる第２連通路４４ｂが１箇所または複数箇所に開けてある。
【００２９】
第２連通路４４ｂの空気は、第１円筒状嵌合部材４４の外周面とキャップ部材４２の内周面との間の摺動隙間を通過して空間５０内に流入する。この空間５０はコイルばね４５が配置されている空間であって、その軸方向の一端側はＯリング４３により気密にシールされている。空間５０の軸方向の他端側はＯリング（環状弾性シール材）５１により気密にシールされている。このＯリング５１は本体部４１の先端部付近の環状の凹溝４１ｆ内に配置され、第１円筒状嵌合部材４４の外周面に弾性的に圧着する。
【００３０】
なお、空間５０は第１円筒状嵌合部材４４の外周鍔部４４ｇにより軸方向の左右に分割された状態を図５に示しているが、この外周鍔部４４ｇの部位においても外周鍔部４４ｇの摺動隙間により空間５０の軸方向の左右は実質上連通状態になっている。
【００３１】
第１円筒状嵌合部材４４の先端部４４ａには径方向に貫通する穴からなる第３連通路４４ｃが開けてある。この第３連通路４４ｃは、検査用治具４０内への配管部材１０の挿入状態（図５）において、２つのＯリング１１、１２の中間となる軸方向部位に位置している。従って、空間５０内の検査用空気を第３連通路４４ｃから２つのＯリング１１、１２の中間部位に導入できる。つまり、上記した第１連通路４６ａ、空間４９、第２連通路４４ｂ、空間５０、第３連通路４４ｃ等により、本発明の入口側連通路を構成している。
【００３２】
更に、２つのＯリング１１、１２のうち、図示の左側のＯリング１１が傷付き等によりシール不良となっている場合には、検査用空気がＯリング１１の装着部を通過した後に、この検査用空気が、配管部材１０と第１円筒状嵌合部材４４との嵌合隙間および配管部材１０の鍔状部１０ｄと本体部４１との嵌合隙間を通過して治具４０の外部へ洩れ出る。つまり、この両嵌合隙間を通過する通路５３（図５）により本発明の出口側連通路の一部を構成している。
【００３３】
一方、図示の右側のＯリング１２のシール不良発生時における検査用空気の洩れ通路を以下のごとく形成している。第１円筒状嵌合部材４４の先端部４４ａにおいて、右側のＯリング１２より更に右側となる部位（開口部４１ａと反対側となる部位）の内周面に、円周方向の凹溝からなる第４連通路４４ｄを形成し、この第４連通路４４ｄに軸方向に延びる穴からなる第５連通路４４ｅの一端を接続連通させている。この第５連通路４４ｅは、第１円筒状嵌合部材４４の円周方向において第３連通路４４ｃとは異なる位置に設けられている。
【００３４】
第５連通路４４ｅの他端は、第１円筒状嵌合部材４４の左側端面（開口部４１ａ側の端面）に開口している。このため、右側のＯリング１２のシール不良発生時には、検査用空気が、配管部材１０と第１円筒状嵌合部材４４との嵌合隙間、円周方向の第４連通路４４ｄ、軸方向の第５連通路４４ｅ、および配管部材１０の鍔状部１０ｄと本体部４１との嵌合隙間を通過して治具４０の外部へ洩れ出る。
【００３５】
なお、第１円筒状嵌合部材４４において、配管部材１０の先端部１０ａの端面に対応する部位（円周方向の第４連通路４４ｄよりも配管部材１０の先端側部位）の内周面に、円周方向の凹溝４４ｆを形成し、この凹溝４４ｆにＯリング（環状弾性シール材）５２を装着し、このＯリング５２を配管部材１０の先端部１０ａの端面付近に弾性的に圧着させて、配管部材１０の先端部１０ａの端面付近を気密にシールしている。このＯリング５２によるシール部は、配管部材１０内の検査用空気が直接、第４連通路４４ｄに流入することを阻止するためのものである。
【００３６】
次に、上記のように構成された検査用治具４０を用いて配管部材１０のＯリングシール部を検査する検査方法を説明する。
【００３７】
（１）配管部材１０の挿入工程
図１は検査用治具４０のフリー状態を示しており、この状態からロック機構４８の円筒状操作部材４８ｂを作業者が手に持って図２の矢印Ａ方向（キャップ部材４２側）へ移動させる。これにより、ロック機構４８のロックボール４８ａが円筒状操作部材４８ｂによる押し下げ状態から解放されて本体部４１の径外方側へ移動可能な状態となる。
【００３８】
円筒状操作部材４８ｂの上記移動位置を保持したまま、次に、配管部材１０の先端側を図３のごとく本体部４１の開口部４１ａ内に挿入し、配管部材１０の先端部端面にて第２円筒状嵌合部材４６をキャップ部材４２側へ押圧する。この配管部材１０の挿入過程で、鍔状部１０ｄにてロックボール４８ａを押し上げる。図３はこのロックボール４８ａを丁度、押し上げている状態を示す。
【００３９】
配管部材１０の挿入を更に続行すると、図４のごとく配管部材１０の鍔状部１０ｄがロックボール４８ａの位置よりも更にキャップ部材４２側へ移動し、第１円筒状嵌合部材４４の先端がキャップ部材４２に当接して停止する。この状態で円筒状操作部材４８ｂの上記移動位置での保持を解除すると、円筒状操作部材４８ｂがコイルばね４８ｃのばね力により元の位置に復帰する。この結果、ロックボール４８ａが円筒状操作部材４８ｂにより強制的に押し下げられる。
【００４０】
この状態において、配管部材１０に加えている挿入力を解除すると、図５に示すように第１円筒状嵌合部材４４がコイルばね４５のばね力により、また、第２円筒状嵌合部材４６がコイルばね４４７のばね力によりそれぞれ開口部４１ａ側に押し戻される。これに伴って、配管部材１０もその鍔状部１０ｄがロックボール４８ａに当接する位置まで押し戻される。これにより、配管部材１０が図５に示す所定の挿入位置にロック（保持）される。
【００４１】
この図５の配管部材ロック状態では、前述のように第１円筒状嵌合部材４４の第３連通路４４ｃが配管部材１０の２つのＯリング１１、１２の中間部位に位置している。
【００４２】
（２）配管部材１０のＯリングシール部のシール不良検査工程
配管部材１０に図示しない高圧空気供給装置を連結して配管部材１０内に検査流体として高圧空気を供給する。ここで、供給空気の圧力は例えば、６〜８ｋｇ／ｃｍ² 程度である。
【００４３】
この供給空気は、前述のように、第２円筒状嵌合部材４６の内周から第１連通路４６ａ→空間４９→第２連通路４４ｂ→空間５０→第３連通路４４ｃを経て配管部材１０の２つのＯリング１１、１２の中間部位に導入される。
【００４４】
２つのＯリング１１、１２がいずれも正常である場合には、２つのＯリング１１、１２が第１円筒状嵌合部材４４の内周面および配管部材１０の凹溝１０ｂ、１０ｃに弾性的に圧着して、配管部材１０と第１円筒状嵌合部材４４との間を気密にシールする。このため、供給空気がＯリング１１、１２部分を通過して洩れ出ることがない。
【００４５】
また、空間５０の軸方向両端部の嵌合部についても、Ｏリング４３、５１によりシールされるので、供給空気が洩れ出ることがない。同様に、配管部材１０の先端部１０ａの端面部においても、Ｏリング５２によりシールされ、供給空気の洩れを防止する。
【００４６】
これに対して、２つのＯリング１１、１２に傷付き等によりシール不良が発生しているとき、例えば、右側のＯリング１２がシール不良であるときは、上記の供給空気が右側のＯリング１２部分を通過して円周方向の凹溝からなる第４連通路４４ｄに流入する。そして、この第４連通路４４ｄには軸方向に延びる第５連通路４４ｅが連通しているので、供給空気が第４、第５連通路４４ｄ、４４ｅを通過して検査用治具４０の外部へ放出される。
【００４７】
また、左側のＯリング１１がシール不良であるときは、上記の供給空気が左側のＯリング１１装着部分から通路５３を通過して、検査用治具４０の外部へ放出される。
【００４８】
以上のように、２つのＯリング１１、１２のいずれか１つがシール不良になっていると、検査用治具４０の外部へ供給空気が放出されるので、この空気放出（空気洩れ）を判定することによりＯリング１１、１２のシール不良を発見できる。
【００４９】
なお、供給空気の放出（洩れ）の判定は、具体的には検査用治具４０を水中に入れて、空気洩れによる気泡の発生を目視観察する方法、あるいは、空気放出による空気圧力の低下を圧力計により測定する方法等により行うことができる。
【００５０】
傷付き等によるＯリング１１、１２のシール不良は、目視観察では発見が困難であるが、本実施形態の検査用治具を用いることにより、傷付き等によるシール不良も的確に発見できる。
【００５１】
また、Ｏリング１１、１２のいずれか一方が万一、組付ミスにより欠品となっている場合も、上記と同様の空気放出（洩れ）が発生して、Ｏリング１１、１２の欠品を発見できる。
【００５２】
（３）シール不良検査終了後の配管部材１０の取り出し工程
図６に示すように、ロック機構４８の円筒状操作部材４８ｂを作業者が手に持って矢印Ａ方向（キャップ部材４２側）へ移動させる。これにより、ロック機構４８のロックボール４８ａが円筒状操作部材４８ｂによる押し下げ状態から解放されて本体部４１の径外方側へ移動可能な状態となる。
【００５３】
このため、コイルばね４７により第２円筒状嵌合部材４６が矢印Ｃのように開口部４１ａ側へ押されると、これに伴って、第２円筒状嵌合部材４６とともに配管部材１０も矢印Ｃ方向に押され、配管部材１０の鍔状部１０ｄがロックボール４８ａを本体部４１の径外方側へ押し上げて、ロックボール４８ａによるロック状態を解除する。図６はこのロック状態の解除後の状態を示しており、配管部材１０を検査用治具４０から取り出すことができる。
【００５４】
ところで、図７は本発明の比較例であり、上記実施形態による第１〜第５連通路４６ａ、４４ｂ、４４ｃ、４４ｄ、４４ｅを設けていない。図７の比較例では、配管部材１０内周の高圧空気が、配管部材１０の先端部１０ａの端面と第２円筒状嵌合部材４６との間の隙間および配管部材１０の先端部１０ａの外周面と第１円筒状嵌合部材４４の先端部４４ａの内周面との間の隙間を経由して、右側のＯリング１２に加わるようになっている。
【００５５】
図７の比較例によると、２つのＯリング１１、１２が同時にシール不良であると、上記高圧空気が２つのＯリング１１、１２部分を通過して検査用治具４０の外部へ洩れ出る。これにより、シール不良を発見できる。しかし、２つのＯリング１１、１２の一方のみがシール不良であるときは、残余の正常なＯリングにより高圧空気の洩れが阻止されるので、一方のＯリングのみのシール不良を発見できない。
【００５６】
これに反し、上記実施形態によると、２つのＯリング１１、１２の中間部位に高圧空気を導入して、２つのＯリング１１、１２のいずれのシール不良によっても検査用治具４０外部への空気洩れが生じるようになっている。そのため、２つのＯリング１１、１２のいずれのシール不良も確実に発見できる。
【００５７】
（他の実施形態）
なお、上記実施形態では、検査流体として空気を使用しているが、空気以外の流体を検査流体として使用してもよいことはもちろんである。
【００５８】
また、上記実施形態では、車両用空調装置の冷媒配管接続部のシール不良の検査に用いる検査用治具について説明したが、本発明の検査用治具はこれに限らず、種々な用途の配管接続部一般に広く適用可能である。
【図面の簡単な説明】
【図１】本発明の一実施形態による検査用治具を示す断面図である。
【図２】上記検査用治具の操作説明用の断面図である。
【図３】上記検査用治具の操作説明用の断面図である。
【図４】上記検査用治具の操作説明用の断面図である。
【図５】上記検査用治具の操作説明用の断面図である。
【図６】上記検査用治具の操作説明用の断面図である。
【図７】本発明の比較例による検査用治具を示す断面図である。
【図８】本発明の検査用治具を適用する従来公知の配管接続構造を示す半断面図である。
【符号の説明】
１０…配管部材、１０ａ…先端部、１０ｄ…鍔状部、
１１、１２…Ｏリング（環状弾性シール材）、
４６ａ、４９、４４ｂ、５０、４４ｃ…入口側連通路、
４４ｄ，４４ｅ、５３…出口側連通路。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inspection jig for inspecting a seal failure in a pipe connection portion, and is suitable for use in, for example, a refrigerant pipe connection portion of a vehicle air conditioner.
[0002]
[Prior art]
Conventionally, in Japanese Patent Laid-Open No. 8-277976, a refrigerant pipe connection structure for a vehicle air conditioner has been proposed. In this prior art, as shown in FIG. 8, two circumferential grooves 10b, 10c are provided adjacent to the tip 10a of the male piping member 10 in the axial direction, and the grooves 10b, 10c The rubber O-rings (annular elastic sealing materials) 11 and 12 are attached to the inner ends of the female piping members 20, and the O-rings 11 and 12 are fitted coaxially with the inner ends of the female pipe members 20. ing.
[0003]
Both the pipe members 10 and 20 are formed of a metal such as aluminum, and the male side pipe member 10 is formed with a flange-like portion 10d projecting radially outward, and this flange-like portion 10d is formed on the flange-like portion 10d. The distal end portion 20a of the female pipe member 20 is brought into contact with it, and the fitting position in the axial direction of both the pipe members 10 and 20 is determined.
[0004]
The resin fastening member 30 attached to the fitting portion of both the pipe members 10 and 20 is composed of a pair of semi-cylindrical members that are latched so as to be opened and closed by a hinge coupling portion (not shown). The member 30 is one of the semi-cylindrical members. By locking the pair of semi-cylindrical fastening members 30, a fastening force in the radial direction is applied to the fitting portions of both the piping members 10 and 20, and the fitting portions of both the piping members 10 and 20 are fastened. Yes. The two O-rings 11, 12 are elastically pressure-bonded to the concave grooves 10 b, 10 c of the distal end portion 10 a of the male piping member 10 and the inner surface of the expanded pipe distal end portion 20 a of the female piping member 20. The heavy seal function is demonstrated.
[0005]
[Problems to be solved by the invention]
By the way, if at least one of the two O-rings 11 and 12 is damaged, the double sealing function cannot be satisfactorily exhibited. Therefore, it is necessary to carry out a leakage inspection of the pipe connection structure and find a seal failure due to damage to the O-rings 11 and 12.
[0006]
In view of the above points, the present invention is to make it possible to reliably find a sealing failure due to a damage or the like of an elastic sealing material in a pipe connection portion that exhibits a multiple sealing function by a plurality of elastic sealing materials arranged in the axial direction. With the goal.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a plurality of annular elastic sealing materials (11, 12) mounted on the outer peripheral side of the distal end portion (10a) of the piping member (10) are juxtaposed in the axial direction. A jig for inspecting seal failure at a pipe connection part,
The first cylindrical fitting member (44) which is fitted to the outer peripheral side of the mounting portion of the annular elastic sealing material (11, 12) of the piping member (10) and to which the annular elastic sealing material (11, 12) is elastically pressure-bonded. )When,
An inlet-side communication path (46a, 49, 44b, 50, 44c) for introducing the inspection fluid flowing from the piping member (10) into an intermediate portion of the plurality of annular elastic sealing materials (11, 12);
When the sealing failure of the annular elastic sealing material (11, 12) occurs, the outlet side communication passages (44d, 44e, 53) that discharge the inspection fluid that has passed through the mounting portion of the annular elastic sealing material (11, 12) to the outside. It is characterized by providing.
[0008]
As a result, if any one of the plurality of annular elastic sealing materials (11, 12) is defective in sealing, the inspection fluid introduced into the intermediate portion of the plurality of annular elastic sealing materials (11, 12) is defective in sealing. It passes through the sealing material mounting portion and is discharged to the outside from the outlet side communication passages (44d, 44e, 53). For this reason, it is possible to reliably detect any one of the plurality of annular elastic sealing materials (11, 12) by determining whether the test fluid is released to the outside.
[0009]
In invention of Claim 2, it has the 2nd cylindrical fitting member (46) fitted to the inner peripheral side of the 1st cylindrical fitting member (44) so that movement to an axial direction is possible,
Specifically, the inlet-side communication passages (46a, 49, 44b, 50, 44c) are configured so that the inspection fluid flowing from the piping member (10) passes through the second cylindrical fitting member (46) from the inner peripheral side to the outer peripheral side. Then, the inspection fluid passes through the first cylindrical fitting member (44) from the inner peripheral side to the outer peripheral side, and further, the inspection fluid passes through the first cylindrical fitting member (44) from the outer peripheral side. It is configured to pass to the peripheral side and reach an intermediate portion of the plurality of annular elastic sealing materials (11, 12).
[0010]
According to claim 2, since the second cylindrical fitting member (46) is fitted to the inner peripheral side of the first cylindrical fitting member (44) so as to be movable in the axial direction, The second cylindrical fitting member (46) can be moved in the axial direction by a spring force, and the piping member (10) can be pushed back in the axial direction by using the axial movement. Thereby, taking-out after the inspection of the piping member (10) is facilitated.
[0011]
Specifically, the outlet side communication passage is formed in the first cylindrical fitting member (44), and one of the annular elastic sealing materials (11, 12) (12). A communication path (44d, 44e) through which the inspection fluid that has passed through the attachment portion flows,
A connection formed by a fitting gap between the first cylindrical fitting member (44) and the piping member (10) and through which the inspection fluid that has passed through the other (11) mounting portion of the annular elastic sealing material (11, 12) flows. It can be constituted by a passage (53).
[0012]
According to a fourth aspect of the present invention, in any one of the first to third aspects, the piping member (10) protrudes radially outward to a portion closer to the center of the piping than the annular elastic sealing material (11, 12). It has a bowl-shaped part (10d),
A lock mechanism (48) that locks the insertion position of the piping member (10) in contact with the hook-shaped portion (10d) is provided.
[0013]
Thereby, the function which locks the insertion position of a piping member (10) using the hook-shaped part (10d) of a piping member (10) can be ensured easily.
[0014]
In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on an embodiment shown in the drawings. The present embodiment relates to an inspection jig applied to a connecting portion of a refrigerant pipe of a vehicle air conditioner described in the above-mentioned Japanese Patent Application Laid-Open No. 8-277976.
[0016]
FIG. 1 shows a free state before the piping member 10 is assembled to the inspection jig 40, and FIGS. 2 to 6 show a process of assembling the piping member 10 to the inspection jig 40 and inspecting the O-ring seal portion. . The piping member 10 is the same as the male piping member 10 shown in FIG. 8 described above, and is formed with two concave grooves 10b and 10c for mounting O-rings (annular elastic sealing materials) 11 and 12 at the tip portion 10a. ing. In addition, the male pipe member 10 is formed with a U-shaped flange-shaped portion 10d protruding outward in a radial direction at a position closer to the center of the pipe (on the opposite end side) than the O-ring mounting portion.
[0017]
The inspection jig 40 has a substantially cylindrical main body 41, and an opening 41 a on one end side (left side in the drawing) of the main body portion 41 in the axial direction (left and right direction in the drawing) is a tip portion of the male piping member 10. It is for accepting the 10a side. A cap member 42 is integrally assembled with the opening 41b on the other axial end side (right side in the figure) of the main body 41, and the opening 41b of the main body 41 is closed.
[0018]
The cylindrical portion 42a of the cap member 42 is fitted to the inner peripheral side of the other end side opening 41b of the main body portion 41, and a rubber O-ring (annular elastic sealing material) 43 is disposed on the fitting portion. The fitting portion is kept airtight.
[0019]
A first cylindrical fitting member 44 is slidably fitted in the axial direction on the inner peripheral side of the cylindrical portion 42a of the main body portion 41 and the cap member 42. In the first cylindrical fitting member 44, the distal end portion 44a on the opening 41a side is a portion corresponding to the distal end portion 20a of the female side piping member 20 of FIG. 8, and the inner diameter of the distal end portion 44a is the male side piping member. The distal end portion 10a of the male pipe member 10 can be inserted into the inner peripheral side of the distal end portion 44a by making it slightly larger than the outer diameter of the distal end portion 10a.
[0020]
A coil spring (spring means) 45 is disposed between the first cylindrical fitting member 44 and the cap member 42, and the first cylindrical fitting member 44 is pressed toward the opening 41a by the spring force of the coil spring 45. It has come to be. For this reason, in the free state of FIG. 1, the outer peripheral flange portion 44 g of the first cylindrical fitting member 44 abuts on the stopper surface 41 c formed on the inner peripheral side of the main body portion 41 by the spring force of the coil spring 45. It has stopped.
[0021]
A second cylindrical fitting member 46 is fitted on the inner peripheral side of the first cylindrical fitting member 44 so as to be slidable in the axial direction. A coil spring (spring means) 47 is also arranged between the second cylindrical fitting member 46 and the cap member 42, and the second cylindrical fitting member 46 is moved to the opening 41 a side by the spring force of the coil spring 47. To be pressed.
[0022]
For this reason, in the free state of FIG. 1, the second cylindrical fitting member 46 comes into contact with the stopper surface 44 h formed on the inner peripheral side of the first cylindrical fitting member 44 by the spring force of the coil spring 47. It has stopped.
[0023]
In addition, a locking mechanism 48 that locks (holds) the insertion position of the distal end portion 20 a of the female pipe member 20 is provided in the distal cylindrical portion 41 d on the opening 41 a side of the substantially cylindrical main body portion 41.
[0024]
The lock mechanism 48 will be described in detail. Circular holding holes 41e are provided at equal intervals in a plurality of locations in the circumferential direction of the distal end cylindrical portion 41d of the main body 41. The holding hole 41e penetrates the distal end cylindrical portion 41d in the radial direction, and the diameter dimension of the holding hole 41e is smaller than the diameter of the lock ball 48a of the locking mechanism 48 on the inner peripheral side of the distal end cylindrical portion 41. The diameter of the hole 41 e is larger than the diameter of the lock ball 48 a of the lock mechanism 48 on the outer peripheral side of the distal end cylindrical portion 41.
[0025]
A cylindrical operation member (sleeve) 48b manually operated by an operator is fitted to the outer peripheral surface of the distal end cylindrical portion 41 of the main body portion 41 so as to be movable in the axial direction. The operating member 48b is pressed toward the opening 41a side by the spring force of a coil spring (spring means) 48c. In the free state, the operating member 48b is held at the position shown in FIG. The lock ball 48a is pushed down to the inner peripheral side of the tip cylindrical portion 41d by the member 48b.
[0026]
The stopper (not shown) can be configured as follows. For example, a circumferential groove is provided in a portion of the distal end cylindrical portion 41d of the main body 41 on the tip side of the holding hole 41e (a portion on the left side of the holding hole 41e in the drawing), and a ring body (for example, a metal C The ring member is fitted and held, and the movement of the operation member 48b to the left side of the figure is restricted by this ring body.
[0027]
Next, the fluid passage configuration for inspecting the seal failure of the two O-rings 11 and 12 of the piping member 10 will be described. FIG. 5 shows the piping member 10 inserted into the inspection jig 40 and locked in place. The air as the inspection fluid is introduced into the inner peripheral side of the second cylindrical fitting member 46 through the piping member 10. A first communication passage 46 a made up of a hole penetrating the second cylindrical fitting member 46 in the radial direction is opened at one or a plurality of locations in an axial intermediate portion of the second cylindrical fitting member 46.
[0028]
Thus, the introduced air passes through the first communication passage 46 a and flows into the space 49 between the outer peripheral side of the second cylindrical fitting member 46 and the inner peripheral side of the first cylindrical fitting member 44. It has become. Also in the first cylindrical fitting member 44, the second communication passage 44 b made of a hole penetrating in the radial direction at an axial portion communicating with the space 49 is opened at one place or a plurality of places.
[0029]
The air in the second communication passage 44 b flows into the space 50 through a sliding gap between the outer peripheral surface of the first cylindrical fitting member 44 and the inner peripheral surface of the cap member 42. This space 50 is a space in which the coil spring 45 is disposed, and one end side in the axial direction is hermetically sealed by an O-ring 43. The other end side in the axial direction of the space 50 is hermetically sealed by an O-ring (annular elastic sealing material) 51. The O-ring 51 is disposed in the annular groove 41 f near the tip of the main body 41 and is elastically pressure-bonded to the outer peripheral surface of the first cylindrical fitting member 44.
[0030]
5 shows a state in which the space 50 is divided into the left and right in the axial direction by the outer peripheral flange 44g of the first cylindrical fitting member 44, the outer peripheral flange 44g also in the region of the outer peripheral flange 44g. Due to the sliding gap, the left and right sides of the space 50 in the axial direction are substantially in communication.
[0031]
A third communication passage 44c made of a hole penetrating in the radial direction is formed in the distal end portion 44a of the first cylindrical fitting member 44. The third communication passage 44c is located at an axial position that is intermediate between the two O-rings 11 and 12 in a state where the piping member 10 is inserted into the inspection jig 40 (FIG. 5). Therefore, the inspection air in the space 50 can be introduced from the third communication path 44 c to the intermediate portion between the two O-rings 11 and 12. That is, the first communication path 46a, the space 49, the second communication path 44b, the space 50, the third communication path 44c and the like described above constitute the inlet side communication path of the present invention.
[0032]
Furthermore, when the left O-ring 11 shown in the drawing has a seal failure due to scratches or the like, the inspection air passes through the mounting portion of the O-ring 11 and then this The inspection air passes through the fitting gap between the piping member 10 and the first cylindrical fitting member 44 and the fitting gap between the flange-like portion 10d of the piping member 10 and the main body portion 41 and goes to the outside of the jig 40. It leaks out. That is, the passage 53 (FIG. 5) passing through both the fitting gaps constitutes a part of the outlet side communication passage of the present invention.
[0033]
On the other hand, a leakage passage for inspection air when a seal failure occurs in the right O-ring 12 shown in the drawing is formed as follows. In the front end portion 44a of the first cylindrical fitting member 44, a circumferential groove is formed on the inner peripheral surface of a portion further to the right side than the right O-ring 12 (a portion opposite to the opening portion 41a). A fourth communication path 44d is formed, and one end of a fifth communication path 44e formed of a hole extending in the axial direction is connected to and communicated with the fourth communication path 44d. The fifth communication path 44 e is provided at a position different from the third communication path 44 c in the circumferential direction of the first cylindrical fitting member 44.
[0034]
The other end of the fifth communication path 44e opens to the left end surface (end surface on the opening 41a side) of the first cylindrical fitting member 44. For this reason, when the seal failure of the right O-ring 12 occurs, the inspection air flows into the fitting gap between the piping member 10 and the first cylindrical fitting member 44, the fourth communication passage 44d in the circumferential direction, and the axial direction. It leaks out of the jig 40 through the fifth communication passage 44e and the fitting gap between the flange 10d of the piping member 10 and the main body 41.
[0035]
Note that, in the first cylindrical fitting member 44, on the inner peripheral surface of the portion corresponding to the end face of the tip portion 10a of the pipe member 10 (the tip side portion of the pipe member 10 relative to the fourth communication passage 44d in the circumferential direction). A circumferential groove 44f is formed, and an O-ring (annular elastic sealing material) 52 is attached to the groove 44f. The O-ring 52 is elastically pressure-bonded to the vicinity of the end surface of the distal end portion 10a of the piping member 10. Thus, the vicinity of the end face of the tip portion 10a of the piping member 10 is hermetically sealed. The seal portion by the O-ring 52 is for preventing the inspection air in the piping member 10 from flowing directly into the fourth communication passage 44d.
[0036]
Next, an inspection method for inspecting the O-ring seal portion of the piping member 10 using the inspection jig 40 configured as described above will be described.
[0037]
(1) Insertion Process of Piping Member 10 FIG. 1 shows a free state of the inspection jig 40. From this state, the operator holds the cylindrical operation member 48b of the lock mechanism 48 in his hand, and the arrow A in FIG. Move in the direction (cap member 42 side). As a result, the lock ball 48a of the lock mechanism 48 is released from the pushed-down state by the cylindrical operation member 48b and can move to the radially outer side of the main body 41.
[0038]
While maintaining the moving position of the cylindrical operation member 48b, next, the distal end side of the piping member 10 is inserted into the opening 41a of the main body 41 as shown in FIG. 2 The cylindrical fitting member 46 is pressed to the cap member 42 side. In the process of inserting the piping member 10, the lock ball 48a is pushed up by the hook-shaped portion 10d. FIG. 3 shows a state where the lock ball 48a is just pushed up.
[0039]
When the insertion of the piping member 10 is further continued, as shown in FIG. 4, the flange-shaped portion 10d of the piping member 10 moves further to the cap member 42 side than the position of the lock ball 48a, and the tip of the first cylindrical fitting member 44 is moved. The cap member 42 contacts and stops. In this state, when the holding of the cylindrical operation member 48b at the moving position is released, the cylindrical operation member 48b returns to the original position by the spring force of the coil spring 48c. As a result, the lock ball 48a is forcibly pushed down by the cylindrical operation member 48b.
[0040]
In this state, when the insertion force applied to the piping member 10 is released, the first cylindrical fitting member 44 is moved by the spring force of the coil spring 45 as shown in FIG. Are pushed back to the opening 41a side by the spring force of the coil spring 447. Along with this, the piping member 10 is also pushed back to a position where the hook-shaped portion 10d abuts against the lock ball 48a. Thereby, the piping member 10 is locked (held) at the predetermined insertion position shown in FIG.
[0041]
In the piping member locked state of FIG. 5, the third communication passage 44 c of the first cylindrical fitting member 44 is located at an intermediate portion between the two O-rings 11 and 12 of the piping member 10 as described above.
[0042]
(2) Seal failure inspection process of the O-ring seal portion of the piping member 10 A high-pressure air supply device (not shown) is connected to the piping member 10 to supply high-pressure air into the piping member 10 as an inspection fluid. Here, the pressure of supply air is about 6-8 kg / cm < ² >, for example.
[0043]
As described above, the supply air passes from the inner periphery of the second cylindrical fitting member 46 through the first communication path 46a → the space 49 → the second communication path 44b → the space 50 → the third communication path 44c. The two O-rings 11 and 12 are introduced into an intermediate portion.
[0044]
When the two O-rings 11 and 12 are both normal, the two O-rings 11 and 12 are elastic to the inner peripheral surface of the first cylindrical fitting member 44 and the concave grooves 10 b and 10 c of the piping member 10. The pipe member 10 and the first cylindrical fitting member 44 are hermetically sealed. For this reason, supply air does not leak through the O-rings 11 and 12.
[0045]
Also, the fitting portions at both ends in the axial direction of the space 50 are sealed by the O-rings 43 and 51, so that supply air does not leak out. Similarly, the end surface portion of the distal end portion 10a of the piping member 10 is also sealed by the O-ring 52 to prevent leakage of supply air.
[0046]
On the other hand, when a seal failure occurs due to scratches or the like on the two O-rings 11 and 12, for example, when the right O-ring 12 has a seal failure, the above supply air is supplied to the right O-ring. It passes through 12 portions and flows into the fourth communication passage 44d formed of a circumferential groove. Since the fourth communication passage 44d is in communication with the fifth communication passage 44e extending in the axial direction, the supply air passes through the fourth and fifth communication passages 44d and 44e and passes through the outside of the inspection jig 40. Is released.
[0047]
Further, when the left O-ring 11 has a poor seal, the supply air passes through the passage 53 from the left O-ring 11 mounting portion and is discharged to the outside of the inspection jig 40.
[0048]
As described above, if any one of the two O-rings 11 and 12 has a poor seal, the supply air is released to the outside of the inspection jig 40, so this air release (air leakage) is determined. By doing so, it is possible to find a sealing failure of the O-rings 11 and 12.
[0049]
The determination of the discharge (leakage) of the supply air is specifically performed by placing the inspection jig 40 in water and visually observing the generation of bubbles due to the air leak, or by reducing the air pressure due to the air discharge. It can be performed by a method of measuring with a pressure gauge.
[0050]
The seal failure of the O-rings 11 and 12 due to scratches or the like is difficult to find by visual observation, but the seal failure due to scratches or the like can be accurately found by using the inspection jig of this embodiment.
[0051]
Also, if any one of the O-rings 11 and 12 is missing due to an assembly error, air discharge (leakage) similar to the above occurs and the O-rings 11 and 12 are missing. Can be found.
[0052]
(3) Removal process of piping member 10 after completion of seal defect inspection As shown in FIG. 6, the operator holds the cylindrical operation member 48b of the lock mechanism 48 in his / her hand and moves it in the direction of arrow A (cap member 42 side). Let As a result, the lock ball 48a of the lock mechanism 48 is released from the pushed-down state by the cylindrical operation member 48b and can move to the radially outer side of the main body 41.
[0053]
For this reason, when the second cylindrical fitting member 46 is pushed toward the opening 41a as indicated by the arrow C by the coil spring 47, the piping member 10 is also moved along with the second cylindrical fitting member 46 along with the arrow C. The hook-shaped portion 10d of the piping member 10 pushes the lock ball 48a to the radially outer side of the main body 41, and the locked state by the lock ball 48a is released. FIG. 6 shows a state after the lock state is released, and the piping member 10 can be taken out from the inspection jig 40.
[0054]
FIG. 7 shows a comparative example of the present invention, in which the first to fifth communication paths 46a, 44b, 44c, 44d, and 44e according to the above embodiment are not provided. In the comparative example of FIG. 7, the high-pressure air in the inner periphery of the piping member 10 is caused by the gap between the end surface of the distal end portion 10 a of the piping member 10 and the second cylindrical fitting member 46 and the outer periphery of the distal end portion 10 a of the piping member 10. This is applied to the right O-ring 12 via a gap between the surface and the inner peripheral surface of the tip end portion 44 a of the first cylindrical fitting member 44.
[0055]
According to the comparative example of FIG. 7, if the two O-rings 11 and 12 are poorly sealed at the same time, the high-pressure air passes through the two O-rings 11 and 12 and leaks out of the inspection jig 40. Thereby, a seal failure can be found. However, when only one of the two O-rings 11 and 12 is poorly sealed, leakage of high-pressure air is prevented by the remaining normal O-rings.
[0056]
On the other hand, according to the above-described embodiment, high-pressure air is introduced into an intermediate portion between the two O-rings 11 and 12, and any of the two O-rings 11 and 12 has a seal failure to the outside of the inspection jig 40. Air leakage occurs. Therefore, any sealing failure of the two O-rings 11 and 12 can be reliably detected.
[0057]
(Other embodiments)
In the above embodiment, air is used as the test fluid, but it is needless to say that a fluid other than air may be used as the test fluid.
[0058]
Moreover, in the said embodiment, although the inspection jig used for the test | inspection of the sealing defect of the refrigerant | coolant piping connection part of a vehicle air conditioner was demonstrated, the inspection jig of this invention is not limited to this, It is piping of various uses. Widely applicable to connecting parts in general.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an inspection jig according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view for explaining the operation of the inspection jig.
FIG. 3 is a cross-sectional view for explaining the operation of the inspection jig.
FIG. 4 is a sectional view for explaining the operation of the inspection jig.
FIG. 5 is a cross-sectional view for explaining the operation of the inspection jig.
FIG. 6 is a cross-sectional view for explaining the operation of the inspection jig.
FIG. 7 is a cross-sectional view showing an inspection jig according to a comparative example of the present invention.
FIG. 8 is a half sectional view showing a conventionally known pipe connection structure to which the inspection jig of the present invention is applied.
[Explanation of symbols]
10 ... piping member, 10a ... tip part, 10d ... bowl-like part,
11, 12 ... O-ring (annular elastic sealing material),
46a, 49, 44b, 50, 44c ... entrance side communication path,
44d, 44e, 53... Exit side communication passage.

Claims

A jig for inspecting a sealing failure in a pipe connecting portion in which a plurality of annular elastic sealing materials (11, 12) mounted on the outer peripheral side of the distal end portion (10a) of the piping member (10) are juxtaposed in the axial direction,
A first cylindrical fitting in which the annular elastic sealing material (11, 12) is elastically pressure-bonded while fitting to the outer peripheral side of the mounting portion of the annular elastic sealing material (11, 12) of the piping member (10). A member (44);
An inlet-side communication passage (46a, 49, 44b, 50, 44c) for introducing the inspection fluid flowing from the piping member (10) into an intermediate portion of the plurality of annular elastic sealing materials (11, 12);
When the sealing failure of the annular elastic sealing material (11, 12) occurs, the outlet side communication passages (44d, 44e) that discharge the inspection fluid that has passed through the mounting portion of the annular elastic sealing material (11, 12) to the outside. 53), and a jig for inspecting a sealing failure of a pipe connection part.

A second cylindrical fitting member (46) fitted to the inner peripheral side of the first cylindrical fitting member (44) so as to be movable in the axial direction;
The inlet side communication path (46a, 49, 44b, 50, 44c)
The test fluid flowing from the piping member (10) passes through the second cylindrical fitting member (46) from the inner peripheral side to the outer peripheral side, and then the test fluid flows into the first cylindrical fitting member ( 44) passes from the inner peripheral side to the outer peripheral side, and further, the inspection fluid passes through the first cylindrical fitting member (44) from the outer peripheral side to the inner peripheral side to pass through the plurality of annular elastic sealing materials (11). 12) The jig for inspecting a sealing failure of a pipe connection part according to claim 1, wherein the jig is configured to reach an intermediate part of 12).

The outlet side communication path is
A communication passage (44d, 44e) formed in the first cylindrical fitting member (44) and through which the inspection fluid that has passed through the mounting portion of one of the annular elastic sealing materials (11, 12) (12);
The inspection which is formed by a fitting gap between the first cylindrical fitting member (44) and the piping member (10) and has passed through the other (11) mounting portion of the annular elastic sealing material (11, 12). 3. The jig for inspecting a sealing failure of a pipe connection part according to claim 1, further comprising a communication path (53) through which a fluid flows.

The piping member (10) has a hook-shaped portion (10d) protruding radially outward at a portion closer to the center of the piping than the mounting portion of the annular elastic sealing material (11, 12),
The pipe connection according to any one of claims 1 to 3, further comprising a lock mechanism (48) that abuts on the hook-shaped part (10d) and locks the insertion position of the pipe member (10). Jig for inspection of defective seals.