JP2005016611A

JP2005016611A - Pipe insulator mounting jig for nut-fitted piping

Info

Publication number: JP2005016611A
Application number: JP2003181006A
Authority: JP
Inventors: Kiyoshi Miwa; 清三輪
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2003-06-25
Filing date: 2003-06-25
Publication date: 2005-01-20

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe insulator mounting jig capable of enhancing the easiness in the mounting operation for a pipe insulator on the nut-fitted piping. <P>SOLUTION: A first 15 and a second split jig piece 16 are coupled together rotatably by a rotary coupling part 19 and are held by magnets 15e and 16e in the normal condition as shown in Fig. (a) so that the split surfaces 15c and 16c of conical half-split shape parts 15a and 16a contact with each other while the split surfaces 15d and 16d of two half-split shape parts 15b and 16b for accommodating a nut are opened from each other, and when the resilient force in the direction in which the pipe insulator contracts is applied to the half-split shape parts 15b and 16b, the split surfaces 15d and 16d of these parts 15b and 16b are approached to each other as shown in Fig. (b) and put in pressure contact with the outside surface of the nut. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、ナット付き配管のパイプインシュレータ装着用治具に関するもので、例えば、車両用空調装置の冷媒配管に用いて好適である。
【０００２】
【従来の技術】
従来、車両用空調装置では、車室内に配置される低圧側の金属製冷媒配管の表面が低温となるので、配管表面で結露が発生する。そこで、冷媒配管に断熱材からなるパイプインシュレータを装着して、配管表面での結露を防ぐようにしている。また、エンジンルーム内に配置される高圧側および低圧側の金属製冷媒配管においては、エンジンルーム内の他部品との接触による衝撃の緩和を目的として、冷媒配管に弾性によるクッション作用を発揮するパイプインシュレータを装着することが実施されている。
【０００３】
上記した冷媒配管は一般にアルミニュウム合金等の金属にて成形され、図９に示すように配管接続のためのナット１１を配管１０の端部付近の外周上に回転可能に保持している。図１０は図９に示すナット付き配管の接続構造を示す断面図であり、一方の冷媒配管１０の端部付近に、接続相手となる他方の冷媒配管３０の内周に装着される挿入部１０ａを形成し、この挿入部１０ａに内径方向へ凹んだリング状の凹溝１０ｂを形成し、このリング状の凹溝１０ｂによりシール用のＯリング１０ｃを収納保持するようになっている。そして、挿入部１０ａにおいて凹溝１０ｂよりも配管軸方向の内側部位に、径外方側へ突き出す円環状の突出部１０ｄをバルジ加工により一体成形している。
【０００４】
一方、ナット１１には円環状の突出部１０ｄの外径よりも小さい内径を有する係止部１１ａが設けてあるので、この係止部１１ａが円環状の突出部１０ｄに接触してナット１１は冷媒配管１０の端部付近の外周上に係止される。
【０００５】
一方の冷媒配管１０の挿入部１０ａを他方の冷媒配管３０の内周に装着すると、Ｏリング１０ｃが他方の冷媒配管３０の内周面に圧接してシール作用を果たす。そして、ナット１１の雌ねじ１１ｂを、他方の冷媒配管３０に形成したユニオン部３０ａの雄ねじ３０ｂに締め付けることにより、両冷媒配管１０、３０を一体に接続する。
【０００６】
ところで、ナット１１付きの配管１０に対してパイプインシュレータ１２を装着するに際して、本出願人においては、従来、図９に示す装着用治具１３を使用している。この装着用治具１３は円錐状案内部１３ａと円筒状のナット収納部１３ｂとを一体に成形したものである。円錐状案内部１３ａはその先端部の最小径部の外径ｄ１がパイプインシュレータ１２の内径ｄ２より小さい円錐状になっている。ナット収納部１３ｂは、ナット１１の六角形状における六角頂部間の外径寸法ｄ７よりも若干量大きい内径ｄ６を有する円筒状になっている。
【０００７】
パイプインシュレータ１２の装着作業を具体的に説明すると、先ず、ナット１１を冷媒配管１０の外周上にて係止部１１ａと円環状の突出部１０ｄとが接触する位置（図１０参照）にセットし、このナット１１のセット位置を図１１のように作業者の指にて保持する。この状態にて、装着用治具１３の円筒状ナット収納部１３ｂをナット１１の全周に被せるように装着する。
【０００８】
次に、パイプインシュレータ１２の一端部を装着用治具１３の円錐状案内部１３ａの先端部から装着用治具１３上に被せ、円錐状案内部１３ａの外径の拡大に沿ってパイプインシュレータ１２の径寸法をナット収納部１３ｂの外径まで拡大してから、パイプインシュレータ１２を冷媒配管１０の外周上に装着する。図１２は、パイプインシュレータ１２の装着を終了した冷媒配管１０の正規組み付け状態を示している。
【０００９】
【発明が解決しようとする課題】
ところで、上記した従来のパイプインシュレータ１２の装着作業によると、装着用治具１３のナット収納部１３ｂは、ナット１１の外周上に所定の間隙を介して遊合しているので、ナット１１の保持作用を果たすことはない。そのため、ナット１１の位置を図１１のように作業者の指で保持するという面倒な作業が必要となり、パイプインシュレータ１２の装着作業性を著しく低下させる原因となっている。
【００１０】
また、作業者の指によるナット１１の保持が確実でないと、ナット１１が図１３に示すようにパイプインシュレータ１２の内部に入り込んでしまうという作業不良も発生する。
【００１１】
本発明は上記点に鑑みて、ナット付き配管に対するパイプインシュレータの装着作業性を向上することを目的とする。
【００１２】
【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、パイプインシュレータ（１２）の軸方向に沿って２つに分割された第１分割治具体（１５）および第２分割治具体（１６）を有し、
第１分割治具体（１５）および第２分割治具体（１６）にそれぞれ、パイプインシュレータ（１２）の装着を案内する円錐状案内部（１７）を２つに分割した円錐半割れ形状部（１５ａ、１６ａ）と、ナット（１１）を収納するためのナット収納部（１８）を２つに分割したナット収納用半割れ形状部（１５ｂ、１６ｂ）とを形成し、
ナット収納用半割れ形状部（１５ｂ、１６ｂ）は、円錐半割れ形状部（１５ａ、１６ａ）の最大径側の部位に隣接して形成され、
更に、円錐半割れ形状部（１５ａ、１６ａ）とナット収納用半割れ形状部（１５ｂ、１６ｂ）との中間部付近に、第１分割治具体（１５）と第２分割治具体（１６）を互いに回転可能に結合する回転結合部（１９）を設け、
外力が加わらない通常状態では、両円錐半割れ形状部（１５ａ、１６ａ）の分割面（１５ｃ、１６ｃ）が互いに接触するとともに、両ナット収納用半割れ形状部（１５ｂ、１６ｂ）の分割面（１５ｄ、１６ｄ）が互いに開離した状態となるように第１、第２分割治具体（１５、１６）を保持する保持手段（１５ｅ、１６ｅ）を備え、
一方、パイプインシュレータ（１２）がナット収納部（１８）の外周側に位置する状態では、パイプインシュレータ（１２）自身の収縮方向への弾性力が保持手段（１５ｅ、１６ｅ）の保持力に打ち勝って、両ナット収納用半割れ形状部（１５ｂ、１６ｂ）の分割面（１５ｄ、１６ｄ）を互いに近接させるとともに、両円錐半割れ形状部（１５ａ、１６ａ）の分割面（１５ｃ、１６ｃ）を互いに開離させ、両ナット収納用半割れ形状部（１５ｂ、１６ｂ）の分割面（１５ｄ、１６ｄ）の近接によりナット収納用半割れ形状部（１５ｂ、１６ｂ）の内壁面がナット（１１）の外周面に圧接するようにしたことを特徴とする。
【００１３】
これによると、パイプインシュレータ（１２）自身の収縮方向への弾性力を利用して、ナット収納用半割れ形状部（１５ｂ、１６ｂ）の内壁面がナット（１１）の外周面に圧接して、ナット（１１）を装着用治具内に確実に保持できる。その結果、ナット（１１）付き配管（１０）にパイプインシュレータ（１２）を装着する際に、ナット（１１）を作業者の指で保持する必要がなくなり、パイプインシュレータ（１２）の装着作業性を著しく向上できる。
【００１４】
また、ナット（１１）を装着用治具内に確実に保持できることから、ナット（１１）がパイプインシュレータ（１２）内部に入り込んでしまうという作業不良も防止できる。
【００１５】
請求項２に記載の発明のように、請求項１において、保持手段は、具体的には、通常状態において両円錐半割れ形状部（１５ａ、１６ａ）の分割面（１５ｃ、１６ｃ）の間に磁気吸引力を発生する磁石（１５ｅ、１６ｅ）で構成できる。
【００１６】
請求項３に記載の発明のように、請求項１または２において、両ナット収納用半割れ形状部（１５ｂ、１６ｂ）の分割面（１５ｄ、１６ｄ）の少なくとも一方を、先端側へ行くにつれてナット収納部（１８）の外方側へ傾斜する傾斜面とすることにより、通常状態において両ナット収納用半割れ形状部（１５ｂ、１６ｂ）の分割面（１５ｄ、１６ｄ）間を互いに開離した状態に設定できる。
【００１７】
請求項４に記載の発明のように、請求項１ないし３のいずれか１つにおいて、両ナット収納用半割れ形状部（１５ｂ、１６ｂ）の底面壁部（１５ｂ’、１６ｂ’）の少なくとも一方を、配管（１０）の端部に接触する位置決め部として形成すれば、ナット収納用半割れ形状部（１５ｂ、１６ｂ）の底面壁部（１５ｂ’、１６ｂ’）により装着用治具の配管（１０）に対する位置決めを行うことができる。
【００１８】
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。
【００１９】
【発明の実施の形態】
以下本発明の一実施形態を図に基づいて説明する。本実施形態は、車両用空調装置の冷媒配管に適用されるパイプインシュレータの装着用治具に関するものである。図１は本実施形態の装着用治具の組み付け状態の正面図で、図２はその分解状態の正面図である。図３、図４は第１、第２分割治具体の詳細図である。
【００２０】
本実施形態において、ナット１１を有する冷媒配管１０は前述の図９、図１０に示すものと同一構成でよい。また、パイプインシュレータ１２も前述の図９、図１０に示すものと同一構成でよい。なお、パイプインシュレータ１２の材質としては、断熱性および弾性に富むゴム系の材質が好適であり、具体的にはＥＰＤＭ（エチレンプロピレン共重合体）の発泡体が好ましい。
【００２１】
本実施形態の装着用治具１４は、パイプインシュレータ１２の軸方向に沿って２つに分割された第１分割治具体１５と第２分割治具体１６とにより構成されている。この第１、第２分割治具体１５、１６にはそれぞれ円錐半割れ形状部１５ａ、１６ａとナット収納用半割れ形状部１５ｂ、１６ｂが軸方向に隣接して一体に形成されている。ここで、装着用治具１４の軸方向とはパイプインシュレータ１２の軸方向と一致する方向であって、図１の左右方向である。
【００２２】
円錐半割れ形状部１５ａ、１６ａは円錐状を装着用治具１４の軸方向（円錐高さ方向）に沿って２つに分割した形状であり、この２つの円錐半割れ形状部１５ａ、１６ａを合体することにより、図９の円錐状案内部１３ａに相当する１つの円錐状案内部１７を構成するようになっている。この円錐状案内部１７の先端部外径ｄ１はパイプインシュレータ１２の内径ｄ２（図９）より小さくなっている。
【００２３】
また、ナット収納用半割れ形状部１５ｂ、１６ｂは円筒形状を装着用治具１４の軸方向に沿って２つに分割した半円筒状の形状であり、この半円筒状の２つのナット収納用半割れ形状部１５ｂ、１６ｂを合体することにより、図９のナット収納部１３ｂに相当する１つの円筒状のナット収納部１８を構成する。
【００２４】
第１分割治具体１５では、装着用治具１４の軸方向と平行な分割面１５ｃを円錐半割れ形状部１５ａの領域のみで形成している。そして、第１分割治具体１５のうち、ナット収納用半割れ形状部１５ｂの領域では分割面１５ｄを所定角度θ（図２）の傾斜面として形成している。すなわち、分割面１５ｄは、軸方向と平行な分割面１５ｃに対して所定角度θでもってナット収納用半割れ形状部１５ｂ（ナット収納部１８）の径外方側へ傾斜する傾斜面になっている。
【００２５】
これに対し、第２分割治具体１６では、円錐半割れ形状部１６ａおよびナット収納用半割れ形状部１６ｂの双方において、装着用治具１４の軸方向と平行な同一面上の分割面１６ｃ、１６ｄ（図２、図４）を形成している。
【００２６】
第１、第２分割治具体１５、１６の円錐半割れ形状部１５ａ、１６ａの領域には、この領域における相対向する分割面１５ｃ、１６ｃを図１のごとく接触した（閉じた）状態に保持する磁石１５ｅ、１６ｅを配置している。具体的には、両分割面１５ｃ、１６ｃにそれぞれ矩形状の凹部を形成し、この矩形状の凹部内に矩形状の磁石１５ｅ、１６ｅを挿入し、接着等の手段により磁石１５ｅ、１６ｅを円錐半割れ形状部１５ａ、１６ａの領域に固定している。上記凹部の形成により磁石１５ｅ、１６ｅの表面が分割面１５ｃ、１６ｃと同一となるようにして磁石１５ｅ、１６ｅが円錐半割れ形状部１５ａ、１６ａに固定される。
【００２７】
第１、第２分割治具体１５、１６において、軸方向の中間部付近、すなわち、円錐半割れ形状部１５ａ、１６ａとナット収納用半割れ形状部１５ｂ、１６ｂとの中間部付近に、第１、第２分割治具体１５、１６を互いに回転可能に結合する回転結合部１９を配置している。
【００２８】
次に、この回転結合部１９の具体的構成を説明すると、図３に示すように第１分割治具体１５において円錐半割れ形状部１５ａとナット収納用半割れ形状部１５ｂの中間部付近に、半円状の突出部１５ｆを分割面１５ｃから外方へ突出するように形成している。この半円状の突出部１５ｆには所定の直径ｄ３を有する円形の軸穴１５ｇが形成してある。
【００２９】
半円状の突出部１５ｆは、分割面１５ｃにおいて第１分割治具体１５の軸方向と直交する方向の中央部のみに形成され、この半円状の突出部１５ｆの前後両側には、半円状の凹部１５ｈ，１５ｉが形成してある。半円状の突出部１５ｆと半円状の凹部１５ｈ，１５ｉは略同一の半径にて１８０°対称位置に形成されている。軸穴１５ｇは第１分割治具体１５の軸方向と直交する方向に向いている。
【００３０】
一方、図４に示すように第２分割治具体１６において円錐半割れ形状部１６ａとナット収納用半割れ形状部１６ｂの中間部付近に、半円状の突出部１６ｆ、１６ｇを分割面１６ｃ、１６ｄから外方へ突出するように形成している。この半円状の突出部１６ｆ、１６ｇには所定の直径ｄ４を有する円形の軸穴１６ｈ、１６ｉが形成してある。
【００３１】
この半円状の突出部１６ｆ、１６ｇは分割面１６ｃと分割面１６ｄの中間部において第２分割治具体１６の軸方向と直交する方向の前後両側に形成されている。そして、前後両側の突出部１６ｆ、１６ｇの間に断面矩形状の凹部１６ｊが形成してある。
【００３２】
ここで、第１分割治具体１５の突出部１５ｆおよび凹部１５ｈ，１５ｉと、第２分割治具体１６の突出部１６ｆ、１６ｇは略同一の半径にて形成され、また、第２分割治具体１６の凹部１６ｊは第１分割治具体１５の突出部１５ｆを嵌合可能な大きさに設定してある。
【００３３】
そのため、第１分割治具体１５の突出部１５ｆが第２分割治具体１６の凹部１６ｊ内に嵌合され、第２分割治具体１６の突出部１６ｆ、１６ｇが第１分割治具体１５の凹部１５ｈ，１５ｉ内に嵌合される。
【００３４】
これにより、第１分割治具体１５の突出部１５ｆの軸穴１５ｇと第２分割治具体１６の突出部１６ｆ、１６ｇの軸穴１６ｈ、１６ｉが第１、第２分割治具体１１５、１６の軸方向と直交する方向に一直線状に並ぶようになっている。そして、この軸穴１５ｇおよび軸穴１６ｈ、１６ｉ内に回転軸２０（図５、図１）を挿入するようになっている。この回転軸２０の軸方向長さＬ１は、第１、第２分割治具体１５、１６の回転結合部１９の形成部位における幅寸法Ｌ２と略同一に設定してある。
【００３５】
この回転軸２０の外径ｄ５は、第１分割治具体１５の突出部１５ｆの軸穴１５ｇの内径ｄ３より若干量小さく、且つ、第２分割治具体１６の突出部１６ｆ、１６ｇの軸穴１６ｈ、１６ｉの内径ｄ４より若干量大きくなるように設定してある。すなわち、ｄ４＜ｄ５＜ｄ３の関係に設定してある。
【００３６】
そのため、回転軸２０と第１分割治具体１５の突出部１５ｆの軸穴１５ｇは所定間隙を介在した遊合状態となり、一方、回転軸２０と第２分割治具体１６の突出部１６ｆ、１６ｇの軸穴１６ｈ、１６ｉは圧入状態となる。この圧入により回転軸２０の両端部は第２分割治具体１６の突出部１６ｆ、１６ｇに支持固定される。そして、第１分割治具体１５の突出部１５ｆは回転軸２０に対して回転可能に結合される。
【００３７】
図１は、上記回転軸２０を介在して第１分割治具体１５と第２分割治具体１６とを回転可能に結合して本実施形態の装着治具１４を構成した状態を示す。そして、図１（ａ）は第１、第２分割治具体１５、１６の円錐半割れ形状部１５ａ、１６ａ側の分割面１５ｃ、１６ｃが磁石１５ｅ、１６ｅの磁気吸引力にて接触している（閉じている）通常状態を示す。この通常状態では、第１、第２分割治具体１５、１６のナット収納用半割れ形状部１５ｂ、１６ｂ側の分割面１５ｄ、１６ｄの間に分割面１５ｄの傾斜角θによる所定の間隙２１が形成されるので、分割面１５ｄ、１６ｄは開離した状態にある。
【００３８】
このナット収納用半割れ形状部１５ｂ、１６ｂ側の分割面１５ｄ、１６ｄの開離状態においては、ナット収納部１８の円筒形状の内径ｄ６が、ナット１１の六角形状における六角頂部間の外径寸法ｄ７（図９）よりも所定量大きくなるように設定してある。
【００３９】
これに対し、図１（ｂ）は、円錐半割れ形状部１５ａ、１６ａ側の分割面１５ｃ、１６ｃが開離し、ナット収納用半割れ形状部１５ｂ、１６ｂ側の分割面１５ｄ、１６ｄが接触した状態を示しており、この図１（ｂ）の状態では間隙２１が消滅することにより、ナット収納部１８の円筒形状の内径が図１（ａ）のｄ６からｄ６’に減少し、この内径ｄ６’はナット１１の六角頂部間の外径寸法ｄ７より小さくなるようにしてある。すなわち、ｄ６’＜ｄ７＜ｄ６の関係を成立するように、分割面１５ｄの傾斜角θが設定してある。
【００４０】
なお、本実施形態では、アルミニュウムのような金属材料を切削加工することにより第１、第２分割治具体１５、１６を形成しているが、第１、第２分割治具体１５、１６を樹脂の成形品から形成することも可能である。
【００４１】
次に、本実施形態による装着治具１４を用いた、パイプインシュレータ１２の装着方法を説明する。
【００４２】
先ず、ナット１１を冷媒配管１０の外周上の端部付近の位置、すなわち、ナット１１の係止部１１ａと冷媒配管１０の円環状の突出部１０ｄとが接触する位置（図１０参照）にセットする。このナット１１のセット位置は冷媒配管１０を水平または冷媒配管１０の挿入部１０ａ側の端部を水平面よりも若干下方へ向けることにより保持できる。
【００４３】
次に、装着用治具１４を図１（ａ）に示すように磁石１５ｅ、１６ｅにより円錐半割れ形状部１５ａ、１６ａ側の分割面１５ｃ、１６ｃが接触している通常状態にセットしておき、この通常状態の装着用治具１４の円筒状ナット収納部１８をナット１１の全周に被せる。この際、円筒状ナット収納部１８の内径ｄ６は、図１（ａ）の通常状態では前述のようにナット１１の六角頂部間の外径寸法ｄ７より大きくしてあるから、円筒状ナット収納部１８をナット１１の全周に何ら支障なく、スムースに被せることができる。これにより、ナット１１全体を図６のように円筒状ナット収納部１８内に収納できる。
【００４４】
ここで、装着用治具１４の円筒状ナット収納部１８の底面壁部すなわち、ナット収納用半割れ形状部１５ｂ、１６ｂの底面壁部１５ｂ’、１６ｂ’が冷媒配管１０の挿入部１０ａの端部に当接することにより、冷媒配管１０に対する装着用治具１４の位置決めをすることができる。従って、これ以後、装着用治具１４は冷媒配管１０の端部と底面壁部１５ｂ’、１６ｂ’との当接位置に維持される。
【００４５】
次に、パイプインシュレータ１２の一端部を装着治具１４の円錐状案内部１７の先端部から装着治具１４上に被せる。装着治具１４の円錐状案内部１７の先端部の外径ｄ１はパイプインシュレータ１２の内径ｄ２より小さいので、パイプインシュレータ１２の一端部を円錐状案内部１７の外周面上にスムースに被せることができる。
【００４６】
そして、パイプインシュレータ１２の一端部を円錐状案内部１７の外周面上で円筒状ナット収納部１８側へ向かって引っ張ることにより、円錐状案内部１７の外径の拡大に沿ってパイプインシュレータ１２の径寸法を円筒状ナット収納部１８の外径まで拡大し、パイプインシュレータ１２を円筒状ナット収納部１８の外周面上に被せることができる。
【００４７】
図７は、パイプインシュレータ１２の一端部がナット収納用半割れ形状部１５ｂ、１６ｂ（円筒状ナット収納部１８）の外周面を通り過ぎて冷媒配管１０の外周上まで到達した状態を示しており、この図７図示の状態では、パイプインシュレータ１２の径寸法拡大に対する弾性反力、すなわち、径寸法収縮方向への弾性力Ｆがパイプインシュレータ１２に発生する。
【００４８】
この収縮方向への弾性力Ｆが磁石１５ｅ、１６ｅの磁気吸引力を上回るように、パイプインシュレータ１２の材質、磁石１５ｅ、１６ｅの磁力等を選択してあるので、パイプインシュレータ１２自身の弾性力Ｆによってナット収納用半割れ形状部１５ｂ、１６ｂ側の分割面１５ｄ、１６ｄが接近するとともに、円錐半割れ形状部１５ａ、１６ａ側の分割面１５ｃ、１６ｃが開離する方向に、第１、第２分割治具体１５、１６が回転軸２０を中心として回転運動を行う。
【００４９】
上記分割面１５ｄ、１６ｄの接近により、円筒状ナット収納部１８の内径ｄ６が図１（ｂ）の内径ｄ６’へ向かって減少するので、円筒状ナット収納部１８の内周面がナット１１の六角頂部に圧接する。この結果、パイプインシュレータ１２自身の弾性力Ｆによってナット１１を装着治具１４の内部に確実に保持できる。
【００５０】
従って、これ以後はパイプインシュレータ１２を図７の左方向に引っ張るだけで、パイプインシュレータ１２を冷媒配管１０の外周上の正規位置（図１２）に簡単に装着できる。従って、ナット１１のセット位置を従来のように作業者の指で押さえる必要がなく、パイプインシュレータ１２の装着作業性を著しく向上できる。しかも、ナット１１を装着治具１４の内部に確実に保持できるので、ナット１１がパイプインシュレータ１２内部に入り込むという作業不良も防止できる。
【００５１】
（他の実施形態）
なお、本発明は上記の一実施形態に限定されることなく、種々変形可能である。例えば、上記の一実施形態では、ナット収納用半割れ形状部１５ｂ、１６ｂ側の分割面１５ｄ、１６ｄのうち、一方の分割面１５ｄのみを所定傾斜角度θの傾斜面としているが、図８のように、両分割面１５ｄ、１６ｄをともに所定傾斜角度の傾斜面としてもよい。
【００５２】
また、上記の一実施形態では、外力が加わらない通常状態（図１（ａ）の状態）の際に、円錐半割れ形状部１５ａ、１６ａ側の分割面１５ｃ、１６ｃが互いに接触するとともに、ナット収納用半割れ形状部１５ｂ、１６ｂ側の分割面１５ｄ、１６ｄが互いに開離した状態に保持する保持手段を磁石１５ｅ、１６ｅにより構成しているが、この保持手段を磁石１５ｅ、１６ｅの代わりにばねを使用して構成してもよい。
【００５３】
すなわち、通常状態ではばねの弾性力によって分割面１５ｃ、１６ｃの接触状態と分割面１５ｄ、１６ｄの開離状態を保持し、パイプインシュレータ１２の収縮方向の弾性力Ｆがナット収納用半割れ形状部１５ｂ、１６ｂに加わると、この収縮方向の弾性力Ｆがばねの弾性力に打ち勝って、分割面１５ｄ、１６ｄが接近する方向に第１、第２分割治具体１５、１６を回転運動させればよい。
【００５４】
また、上記の一実施形態のように、両分割面１５ｄ、１６ｄにそれぞれ磁石１５ｅ、１６ｅを配置せず、両分割面１５ｄ、１６ｄのいずれか一方のみに磁石を配置し、他方には磁性体部材を配置してもよい。
【００５５】
また、上記の一実施形態では、ナット収容部１８の内周形状を円筒形状にしているが、ナット収容部１８の内周形状をナットの六角形状に対応した六角形状にしてもよい。
【００５６】
また、上記の一実施形態では、第１、第２分割治具体１５、１６の円錐半割れ形状部１５ａ、１６ａを、円錐状を２つに分割した形状にしているが、円錐半割れ形状部１５ａ、１６ａは、完全な円形の円錐状でなくとも長円状等に若干変形した円錐状を２つに分割した形状にしてもよい。要するに、円錐半割れ形状部１５ａ、１６ａは第１、第２分割治具体１５、１６の先端部からナット収納用半割れ形状部１５ｂ、１６ｂ側へ向かって径方向の寸法が滑らかに増大する形状であればよい。
【００５７】
また、上記の一実施形態では、ナット収納用半割れ形状部１５ｂ、１６ｂの底面壁部１５ｂ’、１６ｂ’が配管１０の端部に接触して装着用治具１４の位置決め部の役割を果たすようにしているが、ナット収納用半割れ形状部１５ｂ、１６ｂの底面壁部１５ｂ’、１６ｂ’のうち、いずれか一方のみが配管１０の端部に接触して装着用治具１４の位置決め部の役割を果たすようにしてもよい。
【図面の簡単な説明】
【図１】本発明の一実施形態による装着用治具の正面図で、（ａ）は円錐半割れ形状部側の分割面の接触状態を示し、（ｂ）は同分割面の開離状態を示す。
【図２】本発明の一実施形態による装着用治具の分解状態の正面図である。
【図３】（ａ）は本発明の一実施形態による装着用治具の第１分割治具体の平面図、（ｂ）はこの第１分割治具体の正面図、（ｃ）はこの第１分割治具体の右側面図である。
【図４】（ａ）は本発明の一実施形態による装着用治具の第２分割治具体の平面図、（ｂ）はこの第２分割治具体の正面図、（ｃ）はこの第２分割治具体の右側面図である。
【図５】本発明の一実施形態による装着用治具の回転軸の正面図である。
【図６】本発明の一実施形態による装着用治具をナット付き配管に装着した状態の正面図である。
【図７】本発明の一実施形態におけるパイプインシュレータのナット付き配管への装着過程を示す一部断面正面図である。
【図８】本発明による装着用治具の他の実施形態を示す正面図である。
【図９】従来技術におけるナット付き配管、装着用治具およびパイプインシュレータの分解状態の正面図である。
【図１０】従来技術における配管接続構造を示す断面図である。
【図１１】従来技術におけるパイプインシュレータのナット付き配管への装着過程を示す一部断面正面図である。
【図１２】ナット付き配管へのパイプインシュレータの正規装着状態を示す正面図である。
【図１３】ナット付き配管へのパイプインシュレータの不良装着状態を示す一部断面正面図である
【符号の説明】
１０…冷媒配管、１１…ナット、１２…パイプインシュレータ、
１５、１６…第１、第２分割治具体、１５ａ、１６ａ…円錐半割れ形状部、
１５ｂ、１６ｂ…ナット収納用半割れ形状部、
１５ｃ、１５ｄ、１６ｃ、１６ｄ…分割面、
１５ｅ、１６ｅ…磁石（保持手段）、１７…円錐状案内部、
１８…ナット収納部、１９…回転結合部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe insulator mounting jig for pipes with nuts, and is suitable for use, for example, as refrigerant pipes for vehicle air conditioners.
[0002]
[Prior art]
Conventionally, in a vehicle air conditioner, the surface of the low-pressure side metal refrigerant pipe disposed in the passenger compartment is low in temperature, and therefore condensation occurs on the pipe surface. Therefore, a pipe insulator made of a heat insulating material is attached to the refrigerant pipe to prevent condensation on the pipe surface. In addition, in the high-pressure side and low-pressure side metal refrigerant pipes arranged in the engine room, a pipe that exerts an elastic cushioning action on the refrigerant pipe for the purpose of mitigating impact caused by contact with other parts in the engine room It is practiced to install an insulator.
[0003]
The above-described refrigerant pipe is generally formed of a metal such as an aluminum alloy, and a nut 11 for pipe connection is rotatably held on the outer periphery near the end of the pipe 10 as shown in FIG. FIG. 10 is a cross-sectional view showing the connection structure of the pipe with nut shown in FIG. 9, and an insertion portion 10a attached to the inner periphery of the other refrigerant pipe 30 to be connected in the vicinity of the end of one refrigerant pipe 10. A ring-shaped groove 10b that is recessed in the inner diameter direction is formed in the insertion portion 10a, and the sealing O-ring 10c is accommodated and held by the ring-shaped groove 10b. And in the insertion part 10a, the annular protrusion part 10d which protrudes radially outward is integrally formed by the bulge process in the inner site | part of the pipe-axis direction rather than the ditch | groove 10b.
[0004]
On the other hand, since the nut 11 is provided with a locking portion 11a having an inner diameter smaller than the outer diameter of the annular projection 10d, the locking portion 11a comes into contact with the annular projection 10d and the nut 11 It is locked on the outer periphery near the end of the refrigerant pipe 10.
[0005]
When the insertion portion 10 a of one refrigerant pipe 10 is attached to the inner circumference of the other refrigerant pipe 30, the O-ring 10 c presses against the inner circumference surface of the other refrigerant pipe 30 and performs a sealing action. Then, by tightening the female thread 11b of the nut 11 to the male thread 30b of the union part 30a formed in the other refrigerant pipe 30, both the refrigerant pipes 10 and 30 are integrally connected.
[0006]
By the way, when attaching the pipe insulator 12 to the pipe 10 with the nut 11, the present applicant has conventionally used a mounting jig 13 shown in FIG. 9. The mounting jig 13 is formed by integrally forming a conical guide portion 13a and a cylindrical nut storage portion 13b. The conical guide portion 13a has a conical shape in which the outer diameter d1 of the minimum diameter portion at the tip is smaller than the inner diameter d2 of the pipe insulator 12. The nut storage portion 13b has a cylindrical shape having an inner diameter d6 that is slightly larger than an outer diameter d7 between the hexagonal top portions of the hexagonal shape of the nut 11.
[0007]
Specifically, the installation work of the pipe insulator 12 will be described. First, the nut 11 is set on the outer periphery of the refrigerant pipe 10 at a position where the locking portion 11a and the annular protruding portion 10d are in contact (see FIG. 10). The set position of the nut 11 is held by the operator's finger as shown in FIG. In this state, the cylindrical nut storage portion 13 b of the mounting jig 13 is mounted so as to cover the entire circumference of the nut 11.
[0008]
Next, one end portion of the pipe insulator 12 is put on the mounting jig 13 from the tip end portion of the conical guide portion 13a of the mounting jig 13, and the pipe insulator 12 is expanded along with the increase in the outer diameter of the conical guide portion 13a. The pipe insulator 12 is mounted on the outer periphery of the refrigerant pipe 10 after the diameter is expanded to the outer diameter of the nut storage portion 13b. FIG. 12 shows a properly assembled state of the refrigerant pipe 10 after the pipe insulator 12 is mounted.
[0009]
[Problems to be solved by the invention]
By the way, according to the mounting operation of the conventional pipe insulator 12 described above, the nut storage portion 13b of the mounting jig 13 is loosely fitted on the outer periphery of the nut 11 via a predetermined gap, so that the nut 11 is held. It does not work. Therefore, the troublesome work of holding the position of the nut 11 with the operator's finger as shown in FIG. 11 is necessary, which causes the workability of mounting the pipe insulator 12 to be significantly reduced.
[0010]
Further, if the nut 11 is not securely held by the operator's finger, there is a work defect that the nut 11 enters the pipe insulator 12 as shown in FIG.
[0011]
In view of the above points, an object of the present invention is to improve the workability of mounting a pipe insulator on a pipe with a nut.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, the first divided jig body (15) and the second divided jig body (16) divided into two along the axial direction of the pipe insulator (12). Have
Each of the first split jig body (15) and the second split jig body (16) has a conical half crack shape part (15a) obtained by dividing the conical guide part (17) for guiding the mounting of the pipe insulator (12) into two parts. 16a) and a nut storage half-cracked portion (15b, 16b) obtained by dividing the nut storage portion (18) for storing the nut (11) into two parts,
The nut housing half-cracked portion (15b, 16b) is formed adjacent to the portion on the maximum diameter side of the conical half-cracked portion (15a, 16a),
Furthermore, a first split jig body (15) and a second split jig body (16) are provided in the vicinity of an intermediate portion between the conical half crack shape portions (15a, 16a) and the nut housing half crack shape portions (15b, 16b). Providing a rotational coupling part (19) coupled to each other in a rotatable manner;
In a normal state in which no external force is applied, the split surfaces (15c, 16c) of the conical half-cracked portions (15a, 16a) are in contact with each other, and the split surfaces of the nut-cracked half-cracked portions (15b, 16b) ( 15d, 16d) are provided with holding means (15e, 16e) for holding the first and second split jig bodies (15, 16) so that they are separated from each other.
On the other hand, when the pipe insulator (12) is positioned on the outer peripheral side of the nut housing (18), the elastic force in the contraction direction of the pipe insulator (12) itself overcomes the holding force of the holding means (15e, 16e). In addition, the split surfaces (15d, 16d) of the half-crack-shaped portions (15b, 16b) for storing both nuts are brought close to each other, and the split surfaces (15c, 16c) of the conical half-crack-shaped portions (15a, 16a) are opened from each other. The inner wall surface of the half-crack-shaped portion for accommodating the nut (15b, 16b) is moved to the outer peripheral surface of the nut (11) by the proximity of the split surfaces (15d, 16d) of the half-crack-shaped portions for storing both nuts (15b, 16b). It is characterized by being in pressure contact.
[0013]
According to this, using the elastic force in the contraction direction of the pipe insulator (12) itself, the inner wall surface of the half-crack-shaped portion for nut storage (15b, 16b) is pressed against the outer peripheral surface of the nut (11), The nut (11) can be securely held in the mounting jig. As a result, when attaching the pipe insulator (12) to the pipe (10) with the nut (11), it is not necessary to hold the nut (11) with an operator's finger, and the installation workability of the pipe insulator (12) is improved. It can be remarkably improved.
[0014]
In addition, since the nut (11) can be securely held in the mounting jig, it is possible to prevent an operation failure in which the nut (11) enters the pipe insulator (12).
[0015]
As in the second aspect of the present invention, in the first aspect, the holding means is, specifically, between the split surfaces (15c, 16c) of the conical half-cracked portions (15a, 16a) in the normal state. It can be composed of magnets (15e, 16e) that generate magnetic attractive force.
[0016]
As in the third aspect of the present invention, in the first or second aspect, at least one of the split surfaces (15d, 16d) of the half-crack-shaped portions (15b, 16b) for storing both nuts is a nut as it goes to the tip side. In the normal state, the split surfaces (15d, 16d) of the half-crack-shaped portions for storing both nuts (15b, 16b) are separated from each other by adopting an inclined surface that is inclined outwardly of the storage portion (18). Can be set.
[0017]
As in the fourth aspect of the present invention, in any one of the first to third aspects, at least one of the bottom wall portions (15b ', 16b') of the half-crack-shaped portions (15b, 16b) for storing both nuts. Is formed as a positioning portion in contact with the end of the pipe (10), the pipe of the mounting jig (15b ′, 16b ′) is formed by the bottom wall portions (15b ′, 16b ′) of the half-crack-shaped portions for nut storage (15b, 16b). Positioning with respect to 10) can be performed.
[0018]
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.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. This embodiment relates to a jig for mounting a pipe insulator applied to refrigerant piping of a vehicle air conditioner. FIG. 1 is a front view of the mounting jig of the present embodiment in an assembled state, and FIG. 2 is a front view of the disassembled state thereof. 3 and 4 are detailed views of the first and second split jig bodies.
[0020]
In the present embodiment, the refrigerant pipe 10 having the nut 11 may have the same configuration as that shown in FIGS. The pipe insulator 12 may have the same configuration as that shown in FIGS. The material of the pipe insulator 12 is preferably a rubber material rich in heat insulation and elasticity, and specifically, a foam of EPDM (ethylene propylene copolymer) is preferable.
[0021]
The mounting jig 14 of the present embodiment includes a first split jig body 15 and a second split jig body 16 that are divided into two along the axial direction of the pipe insulator 12. The first and second split jig bodies 15 and 16 are respectively formed integrally with conical half-cracked portions 15a and 16a and nut housing half-cracked portions 15b and 16b adjacent to each other in the axial direction. Here, the axial direction of the mounting jig 14 is a direction that coincides with the axial direction of the pipe insulator 12, and is the left-right direction of FIG.
[0022]
The conical half-cracked portions 15a and 16a are formed by dividing the conical shape into two along the axial direction (conical height direction) of the mounting jig 14, and the two conical half-cracked portions 15a and 16a are By combining, one conical guide portion 17 corresponding to the conical guide portion 13a of FIG. 9 is configured. The distal end outer diameter d1 of the conical guide portion 17 is smaller than the inner diameter d2 (FIG. 9) of the pipe insulator 12.
[0023]
Further, the nut housing half-cracked portions 15b and 16b have a semi-cylindrical shape obtained by dividing the cylindrical shape into two along the axial direction of the mounting jig 14, and the two half-cylindrical nut housing portions are accommodated. By combining the half-cracked portions 15b and 16b, one cylindrical nut storage portion 18 corresponding to the nut storage portion 13b of FIG. 9 is configured.
[0024]
In the first split jig body 15, a split surface 15 c parallel to the axial direction of the mounting jig 14 is formed only in the region of the conical half crack shaped portion 15 a. In the first split jig body 15, the split surface 15 d is formed as an inclined surface having a predetermined angle θ (FIG. 2) in the region of the nut housing half-crack-shaped portion 15 b. In other words, the dividing surface 15d is an inclined surface that inclines toward the radially outer side of the nut housing half-cracked portion 15b (nut housing portion 18) at a predetermined angle θ with respect to the dividing surface 15c parallel to the axial direction. Yes.
[0025]
On the other hand, in the second split jig body 16, the split surface 16c on the same plane parallel to the axial direction of the mounting jig 14 in both the conical half crack shape portion 16a and the nut housing half crack shape portion 16b, 16d (FIGS. 2 and 4) is formed.
[0026]
In the regions of the conical half-cracked portions 15a and 16a of the first and second split jig bodies 15 and 16, the opposing split surfaces 15c and 16c in this region are kept in contact (closed) as shown in FIG. Magnets 15e and 16e are arranged. Specifically, a rectangular recess is formed on each of the divided surfaces 15c and 16c, and the rectangular magnets 15e and 16e are inserted into the rectangular recess, and the magnets 15e and 16e are conically shaped by means such as adhesion. It fixes to the area | region of the half crack shape parts 15a and 16a. By forming the concave portions, the magnets 15e and 16e are fixed to the conical half-cracked portions 15a and 16a so that the surfaces of the magnets 15e and 16e are the same as the divided surfaces 15c and 16c.
[0027]
In the first and second split jig bodies 15, 16, in the vicinity of the intermediate portion in the axial direction, that is, in the vicinity of the intermediate portion between the conical half crack shape portions 15 a, 16 a and the nut housing half crack shape portions 15 b, 16 b, In addition, a rotary coupling portion 19 that couples the second divided jig bodies 15 and 16 to each other in a rotatable manner is disposed.
[0028]
Next, a specific configuration of the rotary coupling portion 19 will be described. As shown in FIG. 3, in the first split jig body 15, in the vicinity of an intermediate portion between the conical half crack shape portion 15 a and the nut housing half crack shape portion 15 b, A semicircular protruding portion 15f is formed so as to protrude outward from the dividing surface 15c. A circular shaft hole 15g having a predetermined diameter d3 is formed in the semicircular protruding portion 15f.
[0029]
The semicircular projecting portion 15f is formed only at the center of the dividing surface 15c in the direction orthogonal to the axial direction of the first split jig body 15, and the semicircular projecting portion 15f has a semicircular shape on both front and rear sides. Shaped recesses 15h, 15i are formed. The semicircular protrusion 15f and the semicircular recesses 15h and 15i are formed at 180 ° symmetrical positions with substantially the same radius. The shaft hole 15 g faces the direction orthogonal to the axial direction of the first split jig body 15.
[0030]
On the other hand, as shown in FIG. 4, in the second split jig body 16, semicircular protrusions 16 f and 16 g are formed on the split surface 16 c, in the vicinity of the middle portion between the conical half crack shape portion 16 a and the nut housing half crack shape portion 16 b. It is formed so as to protrude outward from 16d. The semicircular protrusions 16f and 16g are formed with circular shaft holes 16h and 16i having a predetermined diameter d4.
[0031]
The semicircular protrusions 16f and 16g are formed on both front and rear sides in the direction perpendicular to the axial direction of the second split jig body 16 at the intermediate portion between the split surface 16c and the split surface 16d. A recess 16j having a rectangular cross section is formed between the protrusions 16f and 16g on the front and rear sides.
[0032]
Here, the protrusion 15f and the recesses 15h and 15i of the first split jig body 15 and the protrusions 16f and 16g of the second split jig body 16 are formed with substantially the same radius, and the second split jig body 16 is also formed. The recess 16j is set to a size that allows the projection 15f of the first split jig body 15 to be fitted.
[0033]
Therefore, the protrusion 15 f of the first split jig body 15 is fitted into the recess 16 j of the second split jig body 16, and the protrusions 16 f and 16 g of the second split jig body 16 are the recess 15 h of the first split jig body 15. , 15i.
[0034]
Thereby, the shaft hole 15g of the protrusion 15f of the first split jig body 15 and the shaft holes 16h and 16i of the protrusions 16f and 16g of the second split jig body 16 are the shafts of the first and second split jig bodies 115 and 16. It is arranged in a straight line in a direction orthogonal to the direction. The rotating shaft 20 (FIGS. 5 and 1) is inserted into the shaft hole 15g and the shaft holes 16h and 16i. The axial length L1 of the rotary shaft 20 is set to be substantially the same as the width dimension L2 at the portion where the rotary coupling portion 19 of the first and second split jig bodies 15 and 16 is formed.
[0035]
The outer diameter d5 of the rotary shaft 20 is slightly smaller than the inner diameter d3 of the shaft hole 15g of the protrusion 15f of the first split jig body 15, and the shaft holes 16h of the protrusions 16f and 16g of the second split jig body 16 are. , 16i is set to be slightly larger than the inner diameter d4. That is, the relationship d4 <d5 <d3 is set.
[0036]
Therefore, the rotary shaft 20 and the shaft hole 15g of the projecting portion 15f of the first split jig body 15 are in a loose state with a predetermined gap therebetween, while the rotary shaft 20 and the projecting portions 16f and 16g of the second split jig body 16 are in a loose state. The shaft holes 16h and 16i are press-fitted. By this press-fitting, both end portions of the rotary shaft 20 are supported and fixed to the projecting portions 16 f and 16 g of the second split jig body 16. The protrusion 15 f of the first split jig body 15 is coupled to the rotary shaft 20 so as to be rotatable.
[0037]
FIG. 1 shows a state in which the mounting jig 14 of this embodiment is configured by rotatably coupling the first split jig body 15 and the second split jig body 16 with the rotating shaft 20 interposed therebetween. In FIG. 1 (a), the split surfaces 15c and 16c on the conical half-crack-shaped portions 15a and 16a side of the first and second split jig bodies 15 and 16 are in contact with each other by the magnetic attractive force of the magnets 15e and 16e. Indicates the normal state (closed). In this normal state, a predetermined gap 21 due to the inclination angle θ of the divided surface 15d is formed between the half-crack-shaped portions 15b for nut storage of the first and second divided jig bodies 15 and 16 and the divided surfaces 15d and 16d on the 16b side. Since it is formed, the dividing surfaces 15d and 16d are in a separated state.
[0038]
In the separated state of the split surfaces 15d and 16d on the nut-accommodating half-crack-shaped portions 15b and 16b, the cylindrical inner diameter d6 of the nut housing portion 18 is the outer diameter between the hexagonal tops of the hexagonal shape of the nut 11. It is set to be a predetermined amount larger than d7 (FIG. 9).
[0039]
On the other hand, in FIG. 1B, the split surfaces 15c and 16c on the conical half-crack-shaped portions 15a and 16a side are separated, and the split surfaces 15d and 16d on the nut-accommodating half-crack-shaped portions 15b and 16b side are in contact with each other. In this state shown in FIG. 1B, the gap 21 disappears, so that the cylindrical inner diameter of the nut housing portion 18 decreases from d6 to d6 ′ in FIG. 1A, and this inner diameter d6. 'Is smaller than the outer diameter d7 between the hexagonal apexes of the nut 11. That is, the inclination angle θ of the dividing surface 15d is set so that the relationship d6 ′ <d7 <d6 is established.
[0040]
In this embodiment, the first and second divided jig bodies 15 and 16 are formed by cutting a metal material such as aluminum. However, the first and second divided jig bodies 15 and 16 are made of resin. It is also possible to form the molded article.
[0041]
Next, a method for mounting the pipe insulator 12 using the mounting jig 14 according to the present embodiment will be described.
[0042]
First, the nut 11 is set at a position in the vicinity of the end on the outer periphery of the refrigerant pipe 10, that is, a position where the locking portion 11a of the nut 11 and the annular protrusion 10d of the refrigerant pipe 10 are in contact (see FIG. 10). To do. The setting position of the nut 11 can be maintained by turning the refrigerant pipe 10 horizontally or by slightly orienting the end of the refrigerant pipe 10 on the insertion portion 10a side below the horizontal plane.
[0043]
Next, as shown in FIG. 1A, the mounting jig 14 is set in a normal state in which the split surfaces 15c and 16c on the conical half-crack-shaped portions 15a and 16a are in contact with each other by the magnets 15e and 16e. The cylindrical nut housing portion 18 of the mounting jig 14 in the normal state is put on the entire circumference of the nut 11. At this time, the inner diameter d6 of the cylindrical nut housing portion 18 is larger than the outer diameter d7 between the hexagonal top portions of the nut 11 as described above in the normal state of FIG. 18 can be smoothly put on the entire circumference of the nut 11 without any trouble. Thereby, the whole nut 11 can be accommodated in the cylindrical nut accommodating part 18 like FIG.
[0044]
Here, the bottom wall portion of the cylindrical nut storage portion 18 of the mounting jig 14, that is, the bottom wall portions 15 b ′ and 16 b ′ of the nut storage half-crack-shaped portions 15 b and 16 b are the ends of the insertion portion 10 a of the refrigerant pipe 10. By abutting against the part, the mounting jig 14 can be positioned with respect to the refrigerant pipe 10. Therefore, thereafter, the mounting jig 14 is maintained at a contact position between the end of the refrigerant pipe 10 and the bottom wall portions 15b ′ and 16b ′.
[0045]
Next, one end of the pipe insulator 12 is placed on the mounting jig 14 from the tip of the conical guide portion 17 of the mounting jig 14. Since the outer diameter d1 of the tip end portion of the conical guide portion 17 of the mounting jig 14 is smaller than the inner diameter d2 of the pipe insulator 12, one end portion of the pipe insulator 12 can be smoothly covered on the outer peripheral surface of the conical guide portion 17. it can.
[0046]
Then, by pulling one end portion of the pipe insulator 12 on the outer peripheral surface of the conical guide portion 17 toward the cylindrical nut storage portion 18 side, the pipe insulator 12 is expanded along with the increase in the outer diameter of the conical guide portion 17. The diameter can be increased to the outer diameter of the cylindrical nut storage portion 18, and the pipe insulator 12 can be put on the outer peripheral surface of the cylindrical nut storage portion 18.
[0047]
FIG. 7 shows a state in which one end portion of the pipe insulator 12 has reached the outer periphery of the refrigerant pipe 10 by passing through the outer peripheral surface of the half-accommodating portions 15b and 16b (cylindrical nut storage portion 18) for nut storage. In the state shown in FIG. 7, an elastic reaction force against the expansion of the radial dimension of the pipe insulator 12, that is, an elastic force F in the radial dimension contraction direction is generated in the pipe insulator 12.
[0048]
Since the material of the pipe insulator 12 and the magnetic force of the magnets 15e and 16e are selected so that the elastic force F in the contraction direction exceeds the magnetic attractive force of the magnets 15e and 16e, the elastic force F of the pipe insulator 12 itself is selected. As a result, the split surfaces 15d and 16d on the nut housing half-crack-shaped portions 15b and 16b approach and the split surfaces 15c and 16c on the conical half-crack-shaped portions 15a and 16a side are separated in the first and second directions. The split jig bodies 15 and 16 perform a rotational motion around the rotary shaft 20.
[0049]
Due to the approach of the divided surfaces 15d and 16d, the inner diameter d6 of the cylindrical nut storage portion 18 decreases toward the inner diameter d6 ′ of FIG. Press contact with the hexagonal apex. As a result, the nut 11 can be reliably held inside the mounting jig 14 by the elastic force F of the pipe insulator 12 itself.
[0050]
Therefore, after that, the pipe insulator 12 can be easily mounted at the normal position (FIG. 12) on the outer periphery of the refrigerant pipe 10 by simply pulling the pipe insulator 12 to the left in FIG. Therefore, it is not necessary to press the set position of the nut 11 with the operator's finger as in the conventional case, and the workability of installing the pipe insulator 12 can be remarkably improved. In addition, since the nut 11 can be securely held inside the mounting jig 14, it is possible to prevent a work failure in which the nut 11 enters the pipe insulator 12.
[0051]
(Other embodiments)
The present invention is not limited to the above-described embodiment and can be variously modified. For example, in the above-described embodiment, only one of the divided surfaces 15d of the half-crack-shaped portions 15b and 16d for nut storage 15d and 16d is the inclined surface having a predetermined inclination angle θ. Thus, both the dividing surfaces 15d and 16d may be inclined surfaces having a predetermined inclination angle.
[0052]
In the above-described embodiment, the split surfaces 15c and 16c on the conical half-crack-shaped portions 15a and 16a contact each other in the normal state where no external force is applied (the state shown in FIG. 1A), and the nut The holding means for holding the split surfaces 15d and 16d on the side of the half-shaped portions 15b and 16b for storage in a state where they are separated from each other is constituted by the magnets 15e and 16e, but this holding means is used instead of the magnets 15e and 16e. You may comprise using a spring.
[0053]
That is, in the normal state, the contact state of the split surfaces 15c and 16c and the open state of the split surfaces 15d and 16d are maintained by the elastic force of the spring, and the elastic force F in the contraction direction of the pipe insulator 12 When the elastic force F in the contraction direction overcomes the elastic force of the spring when applied to 15b and 16b, the first and second split jig bodies 15 and 16 are rotated in the direction in which the split surfaces 15d and 16d approach. Good.
[0054]
Further, as in the above-described embodiment, the magnets 15e and 16e are not arranged on the two divided surfaces 15d and 16d, respectively, but the magnet is arranged on only one of the two divided surfaces 15d and 16d, and the other is a magnetic Members may be placed.
[0055]
In the above embodiment, the inner peripheral shape of the nut accommodating portion 18 is a cylindrical shape, but the inner peripheral shape of the nut accommodating portion 18 may be a hexagonal shape corresponding to the hexagonal shape of the nut.
[0056]
Moreover, in said one Embodiment, although the conical half crack shape part 15a, 16a of the 1st, 2nd division jig bodies 15 and 16 is made into the shape which divided | segmented the cone shape into two, a conical half crack shape part 15a and 16a may be formed into a shape obtained by dividing a conical shape slightly deformed into an oval shape into two, instead of a perfect circular conical shape. In short, the conical half crack shape portions 15a and 16a have shapes in which the radial dimension smoothly increases from the tip ends of the first and second split jig bodies 15 and 16 toward the nut housing half crack shape portions 15b and 16b. If it is.
[0057]
Further, in the above-described embodiment, the bottom wall portions 15b ′ and 16b ′ of the nut housing half-crack-shaped portions 15b and 16b come into contact with the ends of the pipe 10 and serve as positioning portions for the mounting jig 14. However, only one of the bottom wall portions 15b ′ and 16b ′ of the nut housing half-crack-shaped portions 15b and 16b is in contact with the end portion of the pipe 10 so that the positioning portion of the mounting jig 14 is positioned. You may make it play the role of.
[Brief description of the drawings]
1A and 1B are front views of a mounting jig according to an embodiment of the present invention, in which FIG. 1A shows a contact state of a split surface on a conical half-cracked portion side, and FIG. Indicates.
FIG. 2 is a front view of an exploded state of a mounting jig according to an embodiment of the present invention.
3A is a plan view of a first split jig body of a mounting jig according to an embodiment of the present invention, FIG. 3B is a front view of the first split jig body, and FIG. 3C is the first split jig body. It is a right view of a split jig body.
4A is a plan view of a second split jig body of the mounting jig according to the embodiment of the present invention, FIG. 4B is a front view of the second split jig body, and FIG. 4C is the second split jig body. It is a right view of a split jig body.
FIG. 5 is a front view of a rotating shaft of a mounting jig according to an embodiment of the present invention.
FIG. 6 is a front view of a state in which a mounting jig according to an embodiment of the present invention is mounted on a pipe with a nut.
FIG. 7 is a partial cross-sectional front view showing a process of attaching the pipe insulator to the pipe with a nut in one embodiment of the present invention.
FIG. 8 is a front view showing another embodiment of a mounting jig according to the present invention.
FIG. 9 is a front view of a disassembled state of a pipe with a nut, a mounting jig, and a pipe insulator in the prior art.
FIG. 10 is a cross-sectional view showing a pipe connection structure in the prior art.
FIG. 11 is a partial cross-sectional front view showing a process of attaching a pipe insulator to a pipe with a nut in the prior art.
FIG. 12 is a front view showing a state in which a pipe insulator is properly attached to a pipe with a nut.
FIG. 13 is a partial cross-sectional front view showing a defective mounting state of a pipe insulator in a pipe with a nut.
[Explanation of symbols]
10 ... Refrigerant piping, 11 ... Nut, 12 ... Pipe insulator,
15, 16 ... first and second split jig bodies, 15a, 16a ... conical half-cracked shape part,
15b, 16b ... half-cracked shape portion for storing nuts,
15c, 15d, 16c, 16d ... division surface,
15e, 16e ... magnets (holding means), 17 ... conical guides,
18 ... Nut storage part, 19 ... Rotation coupling part.

Claims

While holding the nut (11) on the outer periphery near the end of the pipe (10),
A pipe insulator mounting jig applied to a pipe with a nut for mounting a pipe insulator (12) on a portion of the outer peripheral surface of the pipe (10) where the nut (11) is not located,
A first split jig body (15) and a second split jig body (16) divided into two along the axial direction of the pipe insulator (12);
A conical half-cracked shape in which a conical guide portion (17) for guiding the mounting of the pipe insulator (12) is divided into two parts on the first split jig body (15) and the second split jig body (16), respectively. Forming a part (15a, 16a) and a half-cracked part for nut storage (15b, 16b) obtained by dividing the nut storage part (18) for storing the nut (11) into two parts;
The nut-storing half-cracked portion (15b, 16b) is formed adjacent to the maximum diameter side portion of the conical half-cracked portion (15a, 16a),
Furthermore, the first split jig body (15) and the second split jig body are disposed in the vicinity of an intermediate portion between the conical half crack shaped portions (15a, 16a) and the nut housing half crack shaped portions (15b, 16b). A rotation coupling part (19) for coupling (16) to each other in a rotatable manner;
In a normal state where no external force is applied, the split surfaces (15c, 16c) of the conical half-cracked portions (15a, 16a) are in contact with each other, and the half-cracked portions (15b, 16b) for storing both nuts are split. Holding means (15e, 16e) for holding the first and second split jig bodies (15, 16) so that the surfaces (15d, 16d) are separated from each other;
On the other hand, in a state where the pipe insulator (12) is positioned on the outer peripheral side of the nut housing portion (18), the elastic force in the contraction direction of the pipe insulator (12) itself is held by the holding means (15e, 16e). Overcoming the force, the split surfaces (15d, 16d) of the nut-splitting half-cracked portions (15b, 16b) are brought close to each other, and the split surfaces (15c) of the conical half-cracked portions (15a, 16a) 16c) are separated from each other,
Due to the proximity of the split surfaces (15d, 16d) of the nut-splitting half-splitting parts (15b, 16b), the inner wall surface of the nut-storing half-splitting part (15b, 16b) is the outer peripheral surface of the nut (11). A pipe insulator mounting jig for pipes with nuts, characterized by being in pressure contact with the nut.

The holding means is a magnet (15e, 16e) that generates a magnetic attractive force between the split surfaces (15c, 16c) of the conical half-cracked portions (15a, 16a) in the normal state. A pipe insulator mounting jig for pipes with nuts according to claim 1.

At least one of the split surfaces (15d, 16d) of the half-crack-shaped portions (15b, 16b) for storing both nuts is an inclined surface that inclines toward the outer side of the nut storage portion (18) as it goes to the tip side. 3. A pipe insulator mounting jig for piping with nuts according to claim 1 or 2.

At least one of the bottom wall portions (15b ′, 16b ′) of the half-crack-shaped portions (15b, 16b) for storing both nuts is formed as a positioning portion that contacts the end portion of the pipe (10). A pipe insulator mounting jig for pipes with nuts according to any one of claims 1 to 3.