JP3563703B2

JP3563703B2 - Heat exchanger for Stirling refrigerator and method of manufacturing the same

Info

Publication number: JP3563703B2
Application number: JP2001042118A
Authority: JP
Inventors: 義明小倉
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2001-02-19
Filing date: 2001-02-19
Publication date: 2004-09-08
Anticipated expiration: 2021-02-19
Also published as: JP2002243291A

Description

【０００１】
【発明の属する技術分野】
本発明は、スターリング冷凍機用熱交換器及びその製造方法に関するものである。
【０００２】
【従来の技術】
図１２は、従来のスターリングエンジンの一例の構成を示す概略的な断面図である。このスターリングエンジン１００は、所定の周期を有して同一のシリンダ１０１内を往復動するピストン１０２及びディスプレーサ１０３を備えたフリーピストン型スターリングエンジンと呼ばれるものである。
【０００３】
シリンダ１０１内に封入された作動ガスは、リニアモータ（図示せず）等の駆動源により一定の周期で往復動するピストン１０２によって圧縮空間１０４内で圧縮され、再生器１０６を経由して膨張空間１０５内に移動する。その際、再生器１０６により圧縮熱の一部が回収され、作動ガスの温度が低下する。そして、膨張空間１０５内に流入した作動ガスはディスプレーサ１０３を押し下げ、ディスプレーサロッド１０７を介して接続されたディスプレーサ支持バネ１０８の弾性によりディスプレーサ１０３はピストン１０２と同一の周期で所定の位相差を有して膨張空間１０５内で往復動する。
【０００４】
膨張空間１０５内で膨張された作動ガスは、往復動するディスプレーサ１０３によって押し出され、再生器１０６を経由して圧縮空間１０４内に移動する。その際、作動ガスは再生器１０６に蓄熱された熱を受け取って温度が上昇する。そして、圧縮空間１０４内でピストン１０２によって再び圧縮される。この一連の逆スターリングサイクルが繰り返されることにより、圧縮空間１０４に隣接して設けられた放熱用熱交換器１１５から熱が放熱されて該放熱用熱交換器１１５が高温になるとともに、膨張空間１０５に隣接して設けられた吸熱用熱交換器１１６により周囲の空気は熱が吸熱されて冷却される。
【０００５】
従って、スターリングエンジン１００の効率を上げて高い冷凍能力を得ようとすれば、放熱用熱交換器１１５からの放熱や吸熱用熱交換器１１６での熱の吸熱を促進してやる必要がある。そのため、放熱用熱交換器１１５や吸熱用熱交換器１１６の構成に対し、従来から種々の工夫が凝らされていた。即ち、周囲を波形に加工した環状コルゲートフィン１１２を再生器１０６に隣接するよう作動ガスの移動経路に位置させて、そこを介して放熱用熱交換器１１５から放熱させるとともに、吸熱用熱交換器１１６にて熱を吸熱させるようにしていた。これにより、スターリングエンジン１００の運転中、外部との熱交換に寄与する有効な表面積が増大し、速やかな放熱及び吸熱が行われるようになる。
【０００６】
以下、放熱用熱交換器１１５を例にして従来の構成について説明する。図１３（ａ）は、放熱用熱交換器１１５の斜視図であり、図１３（ｂ），（ｃ）はその側面近傍を拡大して示す平面図である。放熱用熱交換器１１５は、両端面が開放された円筒状部材１１３と、この円筒状部材１１３に内接して嵌着された環状コルゲートフィン１１２とから成る。環状コルゲートフィン１１２の側面の全周囲には、軸方向に沿って直線状に延びる多数のＶ字状の突出部１１２ａと、これらの突出部１１２ａの間に位置し該突出部１１２ａと略等しい形状の多数の溝部１１２ｂとからなるギザギザが形成されている。尚、吸熱用熱交換器１１６（図１２参照）の構成は、円筒状部材が一端面が閉じた円筒状部材１１７（図１２参照）である点以外は放熱用熱交換器１１５の構成と同様であるので説明を省略する。
【０００７】
環状コルゲートフィン１１２の外径（突出部１１２ａを滑らかに結んでできる円の直径）は、円筒状部材１１３の内径と略等しい寸法に選ばれている。そのため、環状コルゲートフィン１１２の中心が円筒状部材１１３の中心軸と一致するよう、環状コルゲートフィン１１２を円筒状部材１１３の中空部分に軸方向から挿入できる。
【０００８】
しかし、単に挿入しただけでは、環状コルゲートフィン１１２が完全に固定しきられておらず、円筒状部材１１３の円周方向や軸方向に環状コルゲートフィン１１２の位置がずれたりするので、このままでは放熱用熱交換器１１５と成り得ない。そこで、従来は環状コルゲートフィン１１２の突出部１１２ａと円筒状部材１１３の内面とを接着又は溶接することによって、両者の固定を強固なものとしていた。
【０００９】
接着による場合は、図１３（ｂ）に示すように、円筒状部材１１３の内面に接着剤１２６を薄く塗り広げておき、そこに環状コルゲートフィン１１２を挿入した後、所定の位置にしばらく保持して接着剤１２６を乾燥させることにより固定していた。一方、溶接による場合は、図１３（ｃ）に示すように、予め環状コルゲートフィン１１２を円筒状部材１１３内に挿入して所望の位置に支えて仮止めしておき、円筒状部材１１３の内面とコルゲートフィン１１２の突出部１１２ａとの互いに接触又は近接する部分に溶接を施すことで確実に固定していた。１２７はその溶接部である。
【００１０】
しかしながら、このような熱交換器１１５の製造方法では、接着や溶接といった手作業による工程を必要とするため、非常に手間が掛かって熱交換器１１５の生産性が低下する。更に、塗り広げた接着剤の膜圧の不均一性が生じたり、仮止めした環状コルゲートフィン１１２が溶接時に位置ずれしたりするため、得られる熱交換器１１５の性能にバラツキが生じやすく、安定した製品の供給が難しかった。
【００１１】
このような問題を解決するため、本発明者らは以前、上記方法とは異なる熱交換器の製造方法を考案した。図１４は、この熱交換器１２５の製造工程の一部を示す平面図である。まず、図１４（ａ）のように、内部熱交換器となる直線状コルゲートフィン１２１を、両端１２１ａ，１２１ｂを合わせるように筒状に丸めることにより環状コルゲートフィン１２２を形成し、その形を保った状態で保持する。この環状コルゲートフィン１２２の外径は、外部熱交換器となる円筒状の外側円筒状部材１２３の内径と略同一の寸法に選ばれている。
【００１２】
そして、図１４（ｂ）のように、環状コルゲートフィン１２２を、その中心を外側円筒状部材１２３に中心軸に一致させて軸方向から挿入し、所定の位置に仮止めしておく。この状態で、環状コルゲートフィン１２２の内径よりやや大きめの外径寸法に設定された内側円筒状部材１２４を、その中心を環状コルゲートフィン１２２の中心軸に一致させて軸方向から挿入することで、内側から半径方向に環状コルゲートフィン１２２を外側円筒状部材１２３側に圧着して固定する。
【００１３】
これによると、接着や溶接といった製品の精度に誤差が出やすい工程が省かれれるため、性能の安定した熱交換器１２５を量産できるという利点がある。また、内側円筒状部材１２４を新たに設けた構成であるため、熱交換時に、環状コルゲートフィン１２２の一部に偏りがちな温度分布を均一にして熱交換性能の安定化にも有利に作用するものと考えられる。
【００１４】
【発明が解決しようとする課題】
しかしながら、直線状コルゲートフィン１２１を両端１２１ａ，１２１ｂを合わせるように丸めて形を保持した環状コルゲートフィン１２２を外側円筒状部材１２３内に挿入した後、保持していた力を抜くと、前記両端１２１ａ，１２１ｂが離れて、環状コルゲートフィン１２２の丸めた形状が真円にならない場合が起こり得る。
【００１５】
この場合、環状コルゲートフィン１２２の圧着用の内側円筒状部材１２４を挿入する際、半径方向に圧着力が均等に加わらないことがあるため、環状コルゲートフィン１２２がいびつな形状となり、円周方向のフィンピッチの密な部分と疎な部分のバラツキができてしまう。この結果、熱交換器１２５から所望の熱交換性能が得られなくなる恐れがある。
【００１６】
また、環状コルゲートフィン１２２が外側円筒状部材１２３の内面に滑らかに接していないと、圧着用の内側円筒状部材１２４をスムーズに挿入できなくなる。更には、環状コルゲートフィン１２２をそのままの状態で取り扱うと自重によりフィン間の距離が不均一になりやすく、作動ガスの流動が不均一になり、やはり熱交換性能が低下する。
【００１７】
また、外側円筒状部材１２３側に圧着される環状コルゲートフィン１２２の圧着力が弱いと、尖った突出部１２２ａで線接触している環状コルゲートフィン１２２と外側円筒状部材１２３の内面との接触面積を充分に確保できず、熱伝達効率が悪いので、熱交換器１２５としての性能の劣化に繋がる。
【００１８】
本発明は、上記従来の問題点に鑑みてなされたものであり、生産性の向上が図られるとともに、優れた性能が安定して得られるスターリング機関用熱交換器を提供することを目的とする。
【００１９】
【課題を解決するための手段】
上記目的を達成するため本発明によるスターリング冷凍機用熱交換器は、Ｖ字状の断面形状が連続して繋がる直線状コルゲートフィンを筒状に丸め、そのＶ字状の一端と逆Ｖ字状の他端とを係合することにより連結して成る環状コルゲートフィンと、
該環状コルゲートフィンの外径と略等しい内径に選ばれ前記環状コルゲートフィンが軸方向から挿入される外側円筒状部材と、
該環状コルゲートフィンの内径よりわずかに大きな外径に選ばれ前記外側円筒状部材に挿入された前記環状コルゲートフィンの軸方向から挿入される内側円筒状部材とから成るものである。
【００２０】
また、本発明によるスターリング冷凍機用熱交換器は、Ｖ字状の断面形状が連続して繋がる直線状コルゲートフィンを筒状に丸め、そのＶ字状の一端と逆Ｖ字状の他端とを互いの表面にスポット溶接を施すことにより連結して成る環状コルゲートフィンと、
該環状コルゲートフィンの外径と略等しい内径に選ばれ前記環状コルゲートフィンが軸方向から挿入される外側円筒状部材と、
該環状コルゲートフィンの内径よりわずかに大きな外径に選ばれ前記外側円筒状部材に挿入された前記環状コルゲートフィンの軸方向から挿入される内側円筒状部材とから成るものである。
【００２１】
また、本発明によるスターリング冷凍機用熱交換器は、Ｖ字状の断面形状が連続して繋がる直線状コルゲートフィンを筒状に丸め、そのＶ字状の一端と逆Ｖ字状の他端とを互いの表面に接着を施すことにより連結して成る環状コルゲートフィンと、
該環状コルゲートフィンの外径と略等しい内径に選ばれ前記環状コルゲートフィンが軸方向から挿入される外側円筒状部材と、
該環状コルゲートフィンの内径よりわずかに大きな外径に選ばれ前記外側円筒状部材に挿入された前記環状コルゲートフィンの軸方向から挿入される内側円筒状部材とから成るものである。
【００２２】
また、本発明によるスターリング冷凍機用熱交換器は、Ｖ字状の断面形状が連続して繋がる直線状コルゲートフィンを筒状に丸め、そのＶ字状の一端と逆Ｖ字状の他端とを互いの表面に半田付けを施すことにより連結して成る環状コルゲートフィンと、
該環状コルゲートフィンの外径と略等しい内径に選ばれ前記環状コルゲートフィンが軸方向から挿入される外側円筒状部材と、
該環状コルゲートフィンの内径よりわずかに大きな外径に選ばれ前記外側円筒状部材に挿入された前記環状コルゲートフィンの軸方向から挿入される内側円筒状部材とから成るものである。
【００２３】
また、本発明によるスターリング冷凍機用熱交換器は、Ｖ字状の断面形状が連続して繋がる直線状コルゲートフィンを筒状に丸め、その逆Ｖ字状の一端及び他端を互いの表面を接触させて保持しておき、その一端及び他端に断面コの字状の接合部材を装着することにより連結して成る環状コルゲートフィンと、
該環状コルゲートフィンの外径と略等しい内径に選ばれ前記環状コルゲートフィンが軸方向から挿入される外側円筒状部材と、
該環状コルゲートフィンの内径よりわずかに大きな外径に選ばれ前記外側円筒状部材に挿入された前記環状コルゲートフィンの軸方向から挿入される内側円筒状部材とから成るものである。
【００２４】
また、本発明によるスターリング冷凍機用熱交換器は、Ｖ字状の断面形状が連続して繋がる直線状コルゲートフィンを筒状に丸め、その逆Ｖ字状の一端及び他端に形成された切り込みを交差させるように互いに填め込むことにより連結して成る環状コルゲートフィンと、
該環状コルゲートフィンの外径と略等しい内径に選ばれ前記環状コルゲートフィンが軸方向から挿入される外側円筒状部材と、
該環状コルゲートフィンの内径よりわずかに大きな外径に選ばれ前記外側円筒状部材に挿入された前記環状コルゲートフィンの軸方向から挿入される内側円筒状部材とから成るものである。
【００２５】
また、本発明によるスターリング冷凍機用熱交換器は、Ｖ字状の断面形状が連続して繋がる直線状コルゲートフィンを筒状に丸め、その逆Ｖ字状の一端及び他端を互いの表面を接触させて保持すことにより凸部を形成した環状コルゲートフィンと、
前記凸部と嵌合する凹部が内面に設けられるとともに、前記環状コルゲートフィンの外径と略等しい内径に選ばれ前記環状コルゲートフィンが前記凸部と前記凹部との嵌合を伴って軸方向から挿入される外側円筒状部材と、
該環状コルゲートフィンの内径よりわずかに大きな外径に選ばれ前記外側円筒状部材に挿入された前記環状コルゲートフィンの軸方向から挿入される内側円筒状部材とから成るものである。
【００２６】
また、本発明によるスターリング冷凍機用熱交換器は、互いに密着して全体として等間隔に並ぶ波形の突出部が周囲に形成された環状コルゲートフィンと、
該環状コルゲートフィンの外径と略等しい内径に選ばれ前記環状コルゲートフィンが軸方向から挿入される外側円筒状部材と、
該環状コルゲートフィンの内径よりわずかに大きな外径に選ばれ前記外側円筒状部材に挿入された前記環状コルゲートフィンの軸方向から挿入される内側円筒状部材とから成るものである。
【００２７】
これらによると、環状コルゲートフィンが容易に形成されるとともに、内側円筒状部材によって中心から外側円筒状部材側に環状コルゲートフィンは半径方向に圧着され、充分な接触面積を持って外側円筒状部材の内面と密着することとなる。
【００２８】
そして、前記外側円筒状部材に隣接して配され、その内径は前記外側円筒状部材の接合部分では外側円筒状部材の内径と略等しく、反対側に行くに従い連続的に大きくなる傾斜面を有した内面の断面形状にされた円筒状の導入部材と、前記導入部材の前記外側円筒状部材の反対側から予め前記内側円筒状部材を嵌入しておいた前記環状コルゲートフィンを挿入していくとよい。
【００２９】
これによると、環状コルゲートフィンは、内側円筒状部材によって中心から外側へ半径方向に圧迫されながら導入部材の内径の大きなところから小さなところへ徐々に押し込まれていくこととなる。
【００３０】
【発明の実施の形態】
＜第１の実施形態＞
本発明の第１の実施形態について図面を参照して説明する。図１は本実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ），（ｃ）は環状コルゲートフィンを形成する工程であって一部分を拡大して示す平面図、（ｄ）は完成した熱交換器の一部分を拡大して示す平面図である。
【００３１】
図１を参照して本実施形態に係る熱交換器の製造手順について説明する。図１（ａ）のように、Ｖ字状の断面形状が連続的に延びる直線状コルゲートフィン１の一端１ａはＶ字状フィンであり、他端１ｂは逆Ｖ字状フィンになっており、両端１ａ，１ｂともにその間のフィンのフィン長さより短く加工されている。尚、直線状コルゲートフィン１の紙面に対して垂直な方向の厚みは、後述する円筒状の外側円筒状部材３の軸方向の長さより短い寸法に選ばれている。
【００３２】
そして、図１（ａ）矢印のように、両端１ａ，１ｂを合わせるように直線状コルゲートフィン１を筒状に丸め、図１（ｂ）のように一端１ａと他端１ｂとを引っ掛け合わせることにより、図１（ｃ）のような環状コルゲートフィン２を形成する。
【００３３】
これにより、環状コルゲートフィン２は元の直線状態に戻ろうとして引っ掛けられた両端１ａ，１ｂ同士が互いに引っ張り合い、環状コルゲートフィン２の環状にされた形状が保たれることとなる。２ａ，２ｂはそれぞれ、この環状コルゲートフィン２の周囲に形成された突出部，溝部であり、２ｃはその連結部である。
【００３４】
円筒状の外側円筒状部材３の内径は、環状コルゲートフィン２の外径（突出部２ａを滑らかに結んでできる円の直径）と略等しい寸法に選ばれている。従って、環状コルゲートフィン２は、その中心を外側円筒状部材３の中心軸に合わせて軸方向から挿入することができる。そして、このようにして外側円筒状部材３内に挿入した環状コルゲートフィン２を、その先端面が外側円筒状部材３の開放端と揃う位置にずれないよう仮固定しておく。
【００３５】
一方、円筒状の内側円筒状部材４の外径は、環状コルゲートフィン２の内径（溝部２ｂを滑らかに結んでできる円の直径）よりわずかに大きな寸法に選ばれている。従って、内側円筒状部材４は、その中心を環状コルゲートフィン２の中心軸に合わせて軸方向から圧入することができる。そして、内側円筒状部材４を上記のように外側円筒状部材３内に挿入して仮固定している環状コルゲートフィン２内に圧入する。これにより、環状コルゲートフィン２は、内側円筒状部材４の周囲によって内側から外側円筒状部材３側へ半径方向に圧着され、図１（ｄ）のような熱交換器５が完成される。
【００３６】
従って、環状コルゲートフィン２の外側円筒状部材３への接着や溶接といった工程が省略され生産性の向上が図られるとともに、環状コルゲートフィン２を圧着によって確実に固定でき、しかも、環状コルゲートフィン２の全周囲に渡って均一な接触状態が得られるため、性能に優れた熱交換器５を安定して提供できる。
【００３７】
＜第２の実施形態＞
本発明の第２の実施形態について図面を参照して説明する。図２は本実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ），（ｃ）は環状コルゲートフィンを形成する工程であって一部分を拡大して示す平面図、（ｄ）は完成した熱交換器の一部分を拡大して示す平面図である。
【００３８】
図２を参照して本実施形態に係る熱交換器の製造手順について説明する。図２（ａ）のように、Ｖ字状の断面形状が連続的に繋がる直線状コルゲートフィン１の一端１ａはＶ字状フィンであり、他端１ｂは逆Ｖ字状フィンになっており、両端１ａ，１ｂともにその間のフィンのフィン長さより短く加工されている。尚、直線状コルゲートフィン１の紙面に対して垂直な方向の厚みは、後述する円筒状の外側円筒状部材３の軸方向の長さより短い寸法に選ばれている。
【００３９】
そして、図２（ａ）の矢印のように、両端１ａ，１ｂを合わせるように直線状コルゲートフィン１を筒状に丸め、図２（ｂ）のように一端１ａと他端１ｂの表面の一部にロー付け又はスポット溶接を施して接触状態で接合することにより、図２（ｃ）のような環状コルゲートフィン２を形成する。２ａ，２ｂはそれぞれ、この環状コルゲートフィン２の周囲に形成された突出部，溝部であり、２ｄはそのロー付け又は溶接部である。
【００４０】
円筒状の外側円筒状部材３の内径は、環状コルゲートフィン２の外径（突出部２ａを滑らかに結んでできる円の直径）と略等しい寸法に選ばれている。従って、環状コルゲートフィン２は、その中心を外側円筒状部材３の中心軸に合わせて軸方向から挿入することができる。そして、このようにして外側円筒状部材３内に挿入した環状コルゲートフィン２を、その先端面が外側円筒状部材３の開放端と揃う位置にずれないよう仮固定しておく。
【００４１】
一方、円筒状の内側円筒状部材４の外径は、環状コルゲートフィン２の内径（溝部２ｂを滑らかに結んでできる円の直径）よりわずかに大きな寸法に選ばれている。従って、内側円筒状部材４は、その中心を環状コルゲートフィン２の中心軸に合わせて軸方向から圧入することができる。そして、内側円筒状部材４を上記のように外側円筒状部材３内に挿入して仮固定している環状コルゲートフィン２内に圧入する。これにより、環状コルゲートフィン２は、内側円筒状部材４の周囲によって内側から外側円筒状部材３側へ半径方向に圧着され、図２（ｄ）のような熱交換器５が完成される。
【００４２】
従って、環状コルゲートフィン２の外側円筒状部材３への接着や溶接といった工程が省略され生産性の向上が図られるとともに、環状コルゲートフィン２を圧着によって確実に固定でき、しかも、環状コルゲートフィン２の全周囲に渡って均一な接触状態が得られるため、性能に優れた熱交換器５を安定して提供できる。
【００４３】
＜第３の実施形態＞
本発明の第３の実施形態について図面を参照して説明する。図３は本実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ），（ｃ）は環状コルゲートフィンを形成する工程であって一部分を拡大して示す平面図、（ｄ）は完成した熱交換器の一部分を拡大して示す平面図である。
【００４４】
図３を参照して本実施形態に係る熱交換器の製造手順について説明する。図３（ａ）のように、Ｖ字状の断面形状が連続的に繋がる直線状コルゲートフィン１の一端１ａはＶ字状フィンであり、他端１ｂは逆Ｖ字状フィンになっており、両端１ａ，１ｂともにその間のフィンのフィン長さより短く加工されている。尚、直線状コルゲートフィン１の紙面に対して垂直な方向の厚みは、後述する円筒状の外側円筒状部材３の軸方向の長さより短い寸法に選ばれている。
【００４５】
そして、図３（ａ）の矢印のように、予め表面に瞬間接着剤等の接着剤６（図３（ｂ）参照）を均一に塗布した両端１ａ，１ｂを合わせるように直線状コルゲートフィン１を筒状に丸め、図３（ｂ）のように一端１ａと他端１ｂの接着剤６の塗布面を接触させた状態でしばらく保持することにより接着し、図３（ｃ）のような環状コルゲートフィン２を形成する。２ａ，２ｂはそれぞれ、この環状コルゲートフィン２の周囲に形成された突出部，溝部であり、２ｅはその接着部である。
【００４６】
円筒状の外側円筒状部材３の内径は、環状コルゲートフィン２の外径（突出部２ａを滑らかに結んでできる円の直径）と略等しい寸法に選ばれている。従って、環状コルゲートフィン２は、その中心を外側円筒状部材３の中心軸に合わせて軸方向から挿入することができる。そして、このようにして外側円筒状部材３内に挿入した環状コルゲートフィン２を、その先端面が外側円筒状部材３の開放端と揃う位置にずれないよう仮固定しておく。
【００４７】
一方、円筒状の内側円筒状部材４の外径は、環状コルゲートフィン２の内径（溝部２ｂを滑らかに結んでできる円の直径）よりわずかに大きな寸法に選ばれている。従って、内側円筒状部材４は、その中心を環状コルゲートフィン２の中心軸に合わせて軸方向から圧入することができる。そして、内側円筒状部材４を上記のように外側円筒状部材３内に挿入して仮固定している環状コルゲートフィン２内に圧入する。これにより、環状コルゲートフィン２は、内側円筒状部材４の周囲によって内側から外側円筒状部材３側へ半径方向に圧着され、図３（ｄ）のような熱交換器５が完成される。
【００４８】
従って、環状コルゲートフィン２の外側円筒状部材３への接着や溶接といった工程が省略され生産性の向上が図られるとともに、環状コルゲートフィン２を圧着によって確実に固定でき、しかも、環状コルゲートフィン２の全周囲に渡って均一な接触状態が得られるため、性能に優れた熱交換器５を安定して提供できる。
【００４９】
＜第４の実施形態＞
本発明の第４の実施形態について図面を参照して説明する。図４は本実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ），（ｃ）は環状コルゲートフィンを形成する工程であって一部分を拡大して示す平面図、（ｄ）は完成した熱交換器の一部分を拡大して示す平面図である。
【００５０】
図４を参照して本実施形態に係る熱交換器の製造手順について説明する。図４（ａ）のように、Ｖ字状の断面形状が連続的に繋がる直線状コルゲートフィン１の一端１ａはＶ字状フィンであり、他端１ｂは逆Ｖ字状フィンになっており、両端１ａ，１ｂともにその間のフィンのフィン長さより短く加工されている。尚、直線状コルゲートフィン１の紙面に対して垂直な方向の厚みは、後述する円筒状の外側円筒状部材３の軸方向の長さより短い寸法に選ばれている。
【００５１】
そして、図４（ａ）の矢印のように、予め表面にペースト状の半田７（図４（ｂ）参照）を均一に塗布した両端１ａ，１ｂを合わせるように直線状コルゲートフィン１を筒状に丸め、図４（ｂ）のように一端１ａと他端１ｂの半田７の塗布面を接触させた状態でしばらく加熱することにより半田付けし、図４（ｃ）のような環状コルゲートフィン２を形成する。２ａ，２ｂはそれぞれ、この環状コルゲートフィン２の周囲に形成された突出部，溝部であり、２ｆはその半田付け部である。
【００５２】
円筒状の外側円筒状部材３の内径は、環状コルゲートフィン２の外径（突出部２ａを滑らかに結んでできる円の直径）と略等しい寸法に選ばれている。従って、環状コルゲートフィン２は、その中心を外側円筒状部材３の中心軸に合わせて軸方向から挿入することができる。そして、このようにして外側円筒状部材３内に挿入した環状コルゲートフィン２を、その先端面が外側円筒状部材３の開放端と揃う位置にずれないよう仮固定しておく。
【００５３】
一方、円筒状の内側円筒状部材４の外径は、環状コルゲートフィン２の内径（溝部２ｂを滑らかに結んでできる円の直径）よりわずかに大きな寸法に選ばれている。従って、内側円筒状部材４は、その中心を環状コルゲートフィン２の中心軸に合わせて軸方向から圧入することができる。そして、内側円筒状部材４を上記のように外側円筒状部材３内に挿入して仮固定している環状コルゲートフィン２内に圧入する。これにより、環状コルゲートフィン２は、内側円筒状部材４の周囲によって内側から外側円筒状部材３側へ半径方向に圧着され、図４（ｄ）のような熱交換器５が完成される。
【００５４】
従って、環状コルゲートフィン２の外側円筒状部材３への接着や溶接といった工程が省略され生産性の向上が図られるとともに、環状コルゲートフィン２を圧着によって確実に固定でき、しかも、環状コルゲートフィン２の全周囲に渡って均一な接触状態が得られるため、性能に優れた熱交換器５を安定して提供できる。
【００５５】
＜第５の実施形態＞
本発明の第５の実施形態について図面を参照して説明する。図５は本実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ），（ｃ）は環状コルゲートフィンを形成する工程であって一部分を拡大して示す平面図、（ｄ）は完成した熱交換器の一部分を拡大して示す平面図である。
【００５６】
図５を参照して本実施形態に係る熱交換器の製造手順について説明する。図５（ａ）のように、Ｖ字状の断面形状が連続的に繋がる直線状コルゲートフィン１の一端１ａ及び他端１ｂは逆Ｖ字状フィンとなっており、両端１ａ，１ｂともにその間のフィンのフィン長さより短く加工されている。尚、直線状コルゲートフィン１の紙面に対して垂直な方向の厚みは、後述する円筒状の外側円筒状部材３の軸方向の長さより短い寸法に選ばれている。
【００５７】
そして、図５（ａ）の矢印のように、両端１ａ，１ｂを合わせるように直線状コルゲートフィン１を筒状に丸め、図５（ｂ）のように一端１ａと他端１ｂを互いの表面が接触した状態で保持し、弾性が強い材料から成る断面コの字状の接合部材８で連結することにより、図５（ｃ）のような環状コルゲートフィン２を形成する。２ａ，２ｂはそれぞれ、この環状コルゲートフィン２の周囲に形成された突出部，溝部である。
【００５８】
円筒状の外側円筒状部材３の内径は、環状コルゲートフィン２の外径（突出部２ａを滑らかに結んでできる円の直径）と略等しい寸法に選ばれている。従って、環状コルゲートフィン２は、その中心を外側円筒状部材３の中心軸に合わせて軸方向から挿入することができる。そして、このようにして外側円筒状部材３内に挿入した環状コルゲートフィン２を、その先端面が外側円筒状部材３の開放端と揃う位置にずれないよう仮固定しておく。
【００５９】
一方、円筒状の内側円筒状部材４の外径は、環状コルゲートフィン２の内径（溝部２ｂを滑らかに結んでできる円の直径）よりわずかに大きな寸法に選ばれている。従って、内側円筒状部材４は、その中心を環状コルゲートフィン２の中心軸に合わせて軸方向から圧入することができる。そして、内側円筒状部材４を上記のように外側円筒状部材３内に挿入して仮固定している環状コルゲートフィン２内に圧入する。これにより、環状コルゲートフィン２は、内側円筒状部材４の周囲によって内側から外側円筒状部材３側へ半径方向に圧着され、図５（ｄ）のような熱交換器５が完成される。
【００６０】
従って、環状コルゲートフィン２の外側円筒状部材３への接着や溶接といった工程が省略され生産性の向上が図られるとともに、環状コルゲートフィン２を圧着によって確実に固定でき、しかも、環状コルゲートフィン２の全周囲に渡って均一な接触状態が得られるため、性能に優れた熱交換器５を安定して提供できる。
【００６１】
＜第６の実施形態＞
本発明の第６の実施形態について図面を参照して説明する。図６は本実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ）は環状コルゲートフィンの平面図、（ｃ）は環状コルゲートフィンを外側円筒状部材に挿入した状態の平面図、（ｄ）は完成した熱交換器の平面図である。
【００６２】
図６を参照して本実施形態に係る熱交換器の製造手順について説明する。図６（ａ）のように、Ｖ字状の断面形状が連続的に繋がる直線状コルゲートフィン１の一端１ａ及び他端１ｂは逆Ｖ字状フィンとなっており、両端１ａ，１ｂともにその間のフィンのフィン長さより長く加工されている。尚、直線状コルゲートフィン１の紙面に対して垂直な方向の厚みは、後述する円筒状の外側円筒状部材３の軸方向の長さより短い寸法に選ばれている。
【００６３】
そして、図６（ａ）の矢印のように、両端１ａ，１ｂを合わせるように直線状コルゲートフィン１を筒状に丸め、図６（ｂ）のように一端１ａと他端１ｂを少なくとも先端同士が互いに接触する状態で保持しておく。２ａ，２ｂはそれぞれ、この環状コルゲートフィン２の周囲に形成された突出部，溝部である。これにより、両端１ａ及び１ｂは、環状コルゲートフィン２の外径（突出部２ａを滑らかに結んでできる円の直径）より半径方向に突出する凸部２ｇを形成することとなる。
【００６４】
円筒状の外側円筒状部材３の内径は、環状コルゲートフィン２の外径と略等しい寸法に選ばれている。また、外側熱交換器３の内面の一箇所には、環状コルゲートフィン２の凸部２ｇが填り合う凹部３ａが軸方向に延びて設けられている。従って、環状コルゲートフィン２は、その中心を外側円筒状部材３の中心軸に合わせるとともに、その凸部２ｇを外側円筒状部材３の凹部３ａに嵌合させて軸方向から挿入することができる。そして、図６（ｃ）のように、環状コルゲートフィン２を、その先端面が外側円筒状部材３の開放端と揃う位置まで挿入する。
【００６５】
このとき、凸部２ｇを構成する両端１ａ，１ｂには、元の直線状コルゲートフィン１に戻ろうとする力が作用するが、凸部２ｇは凹部３ａ内に動きを規制された状態であるため、環状コルゲートフィン２が半径方向に広がろうとする力に変わる。従って、放置したまま環状コルゲートフィン２を外側円筒状部材３に仮固定しておくことができる。
【００６６】
一方、円筒状の内側円筒状部材４の外径は、環状コルゲートフィン２の内径（溝部２ｂを滑らかに結んでできる円の直径）よりわずかに大きな寸法に選ばれている。従って、内側円筒状部材４は、その中心を環状コルゲートフィン２の中心軸に合わせて軸方向から圧入することができる。そして、内側円筒状部材４を上記のように外側円筒状部材３内に挿入して仮固定している環状コルゲートフィン２内に圧入する。これにより、環状コルゲートフィン２は、内側円筒状部材４の周囲によって内側から外側円筒状部材３側へ半径方向に圧着され、図６（ｄ）のような熱交換器５が完成される。
【００６７】
従って、環状コルゲートフィン２の外側円筒状部材３への接着や溶接といった工程が省略され生産性の向上が図られるとともに、環状コルゲートフィン２を圧着によって確実に固定でき、しかも、環状コルゲートフィン２の全周囲に渡って均一な接触状態が得られるため、性能に優れた熱交換器５を安定して提供できる。
【００６８】
＜第７の実施形態＞
本発明の第７の実施形態について図面を参照して説明する。図７は本実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ），（ｃ）は環状コルゲートフィンを形成する工程であって一部分を拡大して示す平面図、（ｄ）は完成した熱交換器の一部分を拡大して示す平面図である。図８は、図７（ｂ）の斜視図である。
【００６９】
図７及び図８を参照して本実施形態に係る熱交換器の製造手順について説明する。図７（ａ）のように、Ｖ字状の断面形状が連続的に繋がる直線状コルゲートフィン１の一端１ａ及び他端１ｂは逆Ｖ字状フィンとなっており、両端１ａ，１ｂともにその間のフィンのフィン長さより短く加工されている。
【００７０】
直線状コルゲートフィン１の一端１ａ及び他端１ｂにはそれぞれ、一端面から他端面側及び他端面から一端面側に延びる切り込み９（図８参照）が設けられている。尚、直線状コルゲートフィン１の紙面に対して垂直な方向の厚みは、後述する円筒状の外側円筒状部材３の軸方向の長さより短い寸法に選ばれている。
【００７１】
そして、図７（ａ）の矢印のように、両端１ａ，１ｂを合わせるように直線状コルゲートフィン１を筒状に丸め、図７（ｂ）及び図８のように一端１ａと他端１ｂを一方が他方の切り込み９に交互に填り合うように連結することにより、図７（ｃ）のような環状コルゲートフィン２を形成する。２ａ，２ｂはそれぞれ、この環状コルゲートフィン２の周囲に形成された突出部，溝部である。
【００７２】
円筒状の外側円筒状部材３の内径は、環状コルゲートフィン２の外径（突出部２ａを滑らかに結んでできる円の直径）と略等しい寸法に選ばれている。従って、環状コルゲートフィン２は、その中心を外側円筒状部材３の中心軸に合わせて軸方向から挿入することができる。そして、このようにして外側円筒状部材３内に挿入した環状コルゲートフィン２を、その先端面が外側円筒状部材３の開放端と揃う位置にずれないよう仮固定しておく。
【００７３】
一方、円筒状の内側円筒状部材４の外径は、環状コルゲートフィン２の内径（溝部２ｂを滑らかに結んでできる円の直径）よりわずかに大きな寸法に選ばれている。従って、内側円筒状部材４は、その中心を環状コルゲートフィン２の中心軸に合わせて軸方向から圧入することができる。そして、内側円筒状部材４を上記のように外側円筒状部材３内に挿入して仮固定している環状コルゲートフィン２内に圧入する。これにより、環状コルゲートフィン２は、内側円筒状部材４の周囲によって内側から外側円筒状部材３側へ半径方向に圧着され、図７（ｄ）のような熱交換器５が完成される。
【００７４】
従って、環状コルゲートフィン２の外側円筒状部材３への接着や溶接といった工程が省略され生産性の向上が図られるとともに、環状コルゲートフィン２を圧着によって確実に固定でき、しかも、環状コルゲートフィン２の全周囲に渡って均一な接触状態が得られるため、性能に優れた熱交換器５を安定して提供できる。
【００７５】
＜第８の実施形態＞
本発明の第８の実施形態について図面を参照して説明する。図９は本実施形態に係る熱交換器の製造手順の一部であり、（ａ）は環状コルゲートフィンの平面図、（ｂ）は外側円筒状部材の平面図、（ｃ）は環状コルゲートフィンを外側円筒状部材に挿入した状態の平面図である。
【００７６】
図９を参照して熱交換器の作製手順を説明する。環状コルゲートフィン２の外周部には、丸みを帯びた突出部２ｈが形成されており、隣り合う突出部２ｈは互いに密着して全体として等間隔に並ぶ波形の突出部２ｈとなっている。一方、外側円筒状部材３は溶融した金属を金型に流し込んで固めることにより形成され、その内面の全周囲外周部の全周囲に軸方向に延びる波形の溝部１０が等間隔で施されている。
【００７７】
この溝部１０は、環状コルゲートフィン２の突出部２ｈが填り合う形状になっている。従って、環状コルゲートフィン２の中心を外側円筒状部材３の中心軸に合わせて軸方向から挿入することができる。このように、環状コルゲートフィン２を円筒状部材３内に挿入すると、突出部２ｈと溝部１０とが填り合うため、円周方向に沿う位置ずれが防止される。そして、その先端面が外側円筒状部材３の開放端と揃う位置にずれないよう仮固定しておく。
【００７８】
更に、環状コルゲートフィン２の内径よりわずかに大きな外径を有する円筒状の内側円筒状部材４（図示せず）を、外側円筒状部材３内に挿入して仮固定している環状コルゲートフィン２内に軸方向から圧入する。これにより、環状コルゲートフィン２は、内側円筒状部材４の周囲によって内側から外側円筒状部材３側へ半径方向に圧着され、熱交換器５（図示せず）が完成される。
【００７９】
従って、本実施形態によると、環状コルゲートフィン２が外側円筒状部材３の内面に強固に密着され、環状コルゲートフィン２の全周囲に渡って充分な接触面積が確保されるため、性能に優れた熱交換器５を安定して提供できる。
【００８０】
＜第９の実施形態＞
本発明の第９の実施形態について図面を参照して説明する。図１０は、本実施形態に係る熱交換器の製造手順の一部であり、（ａ）は環状コルゲートフィンを導入部材側から挿入する前の断面図、（ｂ）はその挿入後の断面図である。図１１は、その熱交換器の側面近傍を拡大して示す平面図である。
【００８１】
図１０（ａ）、（ｂ）に示すように、円筒状の外側円筒状部材３は、その軸方向が略水平になるよう導入部材１１とともに治具１２に固定されている。外側円筒状部材３に隣接して設けられた導入部材１１は、外側円筒状部材３と略等しい外径を有し、その内径は接合部分では外側円筒状部材３の内径と略等しく、反対側に行くに従い連続的に大きくなる傾斜面１１ａを有した内面の断面形状となっている。
【００８２】
以下、本実施形態に係る熱交換器の製造手順について図１０を参照して説明する。環状コルゲートフィン２は、上記第１〜第７の実施形態で述べたように直線状から環状に形成した環状コルゲートフィン２（図１〜図７参照）をそのまま使用するものとする。尚、この環状コルゲートフィン２は、外力により容易に変形する柔軟性に富む材料によって形成しておく。
【００８３】
環状コルゲートフィン２内には、該環状コルゲートフィン２の内径よりわずかに大きな外径に選ばれた内側円筒状部材４が軸方向から嵌入されている。そして、この状態で、図１０（ａ）のように、環状コルゲートフィン２を導入部材１１の外側円筒状部材３の相対する側から軸方向に挿入していく。これにより、環状コルゲートフィン２は、内側円筒状部材４によって中心から外側へ半径方向に圧迫されながら導入部材１１の傾斜面１１ａに沿って内径の大きなところから小さなところへ徐々に押し込まれていくこととなる。
【００８４】
そして、図１０（ｂ）に示すように、環状コルゲートフィン２の先端面が、外側円筒状部材３と導入部材１１の接合部に達したところで圧入を終了する。これにより、環状コルゲートフィン２の突出部２ｂは導入部材１１の内面と擦れ合って、その突出部２ｂの形状が円弧形状から平面状へと変形していく。この変形により、図１１のように、環状コルゲートフィン２と外側円筒状部材３の内面との接触面積が拡大される。
【００８５】
この効果は、導入部材１１の材質の硬さが、環状コルゲートフィン２の材質の硬さよりも大きい場合に顕著に現れる。従って、外側円筒状部材３の内面との接触面積が充分に確保され、熱交換器５の熱交換効率の向上が図られる。
【００８６】
【発明の効果】
以上説明したように本発明によると、環状コルゲートフィンの外側円筒状部材への接着や溶接といった工程が省略され生産性の向上が図られるとともに、環状コルゲートフィンを圧着によって確実に固定でき、しかも、環状コルゲートフィンの全周囲に渡って均一な接触状態が得られるため、性能に優れた熱交換器を安定して提供できる。
【図面の簡単な説明】
【図１】本発明の第１の実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ），（ｃ）は環状コルゲートフィンを形成する工程であって一部分を拡大して示す平面図、（ｄ）は完成した熱交換器の一部分を拡大して示す平面図である。
【図２】本発明の第２の実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ），（ｃ）は環状コルゲートフィンを形成する工程であって一部分を拡大して示す平面図、（ｄ）は完成した熱交換器の一部分を拡大して示す平面図である。
【図３】本発明の第３の実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ），（ｃ）は環状コルゲートフィンを形成する工程であって一部分を拡大して示す平面図、（ｄ）は完成した熱交換器の一部分を拡大して示す平面図である。
【図４】本発明の第４の実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ），（ｃ）は環状コルゲートフィンを形成する工程であって一部分を拡大して示す平面図、（ｄ）は完成した熱交換器の一部分を拡大して示す平面図である。
【図５】本発明の第５の実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ），（ｃ）は環状コルゲートフィンを形成する工程であって一部分を拡大して示す平面図、（ｄ）は完成した熱交換器の一部分を拡大して示す平面図である。
【図６】本発明の第６の実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ）は環状コルゲートフィンの平面図、（ｃ）は環状コルゲートフィンを外側円筒状部材に挿入した状態の平面図、（ｄ）は完成した熱交換器の平面図である。
【図７】本発明の第７の実施形態に係る熱交換器の製造手順の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ），（ｃ）は環状コルゲートフィンを形成する工程であって一部分を拡大して示す平面図、（ｄ）は完成した熱交換器の一部分を拡大して示す平面図である。
【図８】図７（ｂ）の斜視図である。
【図９】本発明の第８の実施形態に係る熱交換器の製造手順の一部であり、（ａ）は環状コルゲートフィンの平面図、（ｂ）は外側円筒状部材の平面図、（ｃ）は環状コルゲートフィンを外側円筒状部材に挿入した状態の平面図である。
【図１０】本発明の第９の実施形態に係る熱交換器の製造手順の一部であり、（ａ）は環状コルゲートフィンを導入部材側から挿入する前の断面図、（ｂ）はその挿入後の断面図である。
【図１１】その熱交換器の側面近傍を拡大して示す平面図である。
【図１２】従来のスターリングエンジンの一例の構成を示す概略的な断面図である。
【図１３】そのエンジンに組み込まれる放熱用熱交換器の斜視図（ａ）及びその側面近傍を拡大して示す平面図（ｂ），（ｃ）である。
【図１４】従来の熱交換器の他の例の製造工程の一部であり、（ａ）は直線状コルゲートフィンの平面図、（ｂ）は環状コルゲートフィンの平面図、（ｃ）は環状コルゲートフィンを外側円筒状部材に挿入した状態の平面図、（ｄ）は完成した熱交換器の平面図である。
【符号の説明】
１直線状コルゲートフィン
２環状コルゲートフィン
３外側円筒状部材
４内側円筒状部材
５熱交換器
６接着剤
７半田
８接合部材
９切り込み
１０溝部
１１導入部材
１２治具[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat exchanger for a Stirling refrigerator and a method for manufacturing the same.
[0002]
[Prior art]
FIG. 12 is a schematic sectional view showing a configuration of an example of a conventional Stirling engine. The Stirling engine 100 is a so-called free-piston Stirling engine including a piston 102 and a displacer 103 that reciprocate in the same cylinder 101 at a predetermined cycle.
[0003]
The working gas sealed in the cylinder 101 is compressed in a compression space 104 by a piston 102 reciprocating at a constant cycle by a driving source such as a linear motor (not shown), and is expanded through a regenerator 106 to an expansion space. Move into 105. At that time, part of the compression heat is recovered by the regenerator 106, and the temperature of the working gas decreases. Then, the working gas flowing into the expansion space 105 pushes down the displacer 103, and the displacer 103 has a predetermined phase difference at the same cycle as the piston 102 due to the elasticity of the displacer support spring 108 connected via the displacer rod 107. And reciprocate in the expansion space 105.
[0004]
The working gas expanded in the expansion space 105 is pushed out by the reciprocating displacer 103 and moves into the compression space 104 via the regenerator 106. At that time, the working gas receives the heat stored in the regenerator 106 and its temperature rises. Then, it is compressed again by the piston 102 in the compression space 104. By repeating this series of reverse Stirling cycles, heat is radiated from the heat radiating heat exchanger 115 provided adjacent to the compression space 104, and the heat radiating heat exchanger 115 becomes high in temperature. The surrounding air is absorbed by the heat-exchanging heat exchanger 116 provided adjacent to the air-conditioning device and is cooled.
[0005]
Therefore, in order to increase the efficiency of the Stirling engine 100 and obtain a high refrigerating capacity, it is necessary to promote the heat radiation from the heat radiating heat exchanger 115 and the heat absorption by the heat absorbing heat exchanger 116. Therefore, various contrivances have been conventionally made on the configuration of the heat exchanger 115 for heat radiation and the heat exchanger 116 for heat absorption. That is, the annular corrugated fin 112 whose periphery is processed into a waveform is positioned on the movement path of the working gas so as to be adjacent to the regenerator 106, and the heat is radiated from the heat exchanger 115 for heat radiation therethrough. At 116, heat was absorbed. Thus, during operation of the Stirling engine 100, the effective surface area that contributes to heat exchange with the outside increases, and rapid heat dissipation and heat absorption are performed.
[0006]
Hereinafter, a conventional configuration will be described using the heat exchanger 115 for heat radiation as an example. FIG. 13A is a perspective view of the heat-radiating heat exchanger 115, and FIGS. 13B and 13C are enlarged plan views showing the vicinity of the side surface thereof. The heat-radiating heat exchanger 115 includes a cylindrical member 113 whose both end surfaces are open, and an annular corrugated fin 112 fitted in contact with the cylindrical member 113. Around the entire periphery of the side surface of the annular corrugated fin 112, a number of V-shaped protrusions 112a extending linearly along the axial direction, and a shape positioned between these protrusions 112a and substantially equal to the protrusions 112a And a large number of grooves 112b. The configuration of the heat-exchanging heat exchanger 116 (see FIG. 12) is the same as the configuration of the heat-radiating heat exchanger 115 except that the cylindrical member is a cylindrical member 117 (see FIG. 12) having one end face closed. Therefore, the description is omitted.
[0007]
The outer diameter of the annular corrugated fin 112 (diameter of a circle formed by smoothly connecting the protruding portions 112a) is selected to be substantially equal to the inner diameter of the cylindrical member 113. Therefore, the annular corrugated fins 112 can be inserted into the hollow portion of the cylindrical member 113 from the axial direction so that the center of the annular corrugated fin 112 coincides with the central axis of the cylindrical member 113.
[0008]
However, simply inserting the annular corrugated fins 112 is not completely fixed, and the position of the annular corrugated fins 112 is shifted in the circumferential direction or the axial direction of the cylindrical member 113. It cannot be the heat exchanger 115. Therefore, conventionally, the protrusions 112a of the annular corrugated fins 112 and the inner surface of the cylindrical member 113 are bonded or welded to each other, thereby firmly fixing the two.
[0009]
In the case of bonding, as shown in FIG. 13B, an adhesive 126 is spread thinly on the inner surface of the cylindrical member 113, and after inserting the annular corrugated fin 112 there, the holder is held at a predetermined position for a while. The adhesive 126 was fixed by drying. On the other hand, in the case of welding, as shown in FIG. 13 (c), the annular corrugated fins 112 are inserted into the cylindrical member 113 in advance, temporarily supported at a desired position, and temporarily fixed to the inner surface of the cylindrical member 113. The portions that are in contact with or adjacent to each other and the protruding portion 112a of the corrugated fin 112 are securely fixed by welding. 127 is the welded portion.
[0010]
However, such a method of manufacturing the heat exchanger 115 requires a manual process such as bonding and welding, which takes much time and reduces the productivity of the heat exchanger 115. Furthermore, the unevenness of the film pressure of the spread adhesive occurs, and the temporarily fixed annular corrugated fins 112 are displaced at the time of welding. It was difficult to supply the products.
[0011]
In order to solve such a problem, the present inventors have previously devised a method of manufacturing a heat exchanger different from the above method. FIG. 14 is a plan view showing a part of the manufacturing process of the heat exchanger 125. First, as shown in FIG. 14A, an annular corrugated fin 122 is formed by rolling a straight corrugated fin 121 serving as an internal heat exchanger into a tubular shape so that both ends 121a and 121b are aligned, and the shape is maintained. And hold it. The outer diameter of the annular corrugated fin 122 is selected to be substantially the same as the inner diameter of the cylindrical outer cylindrical member 123 serving as an external heat exchanger.
[0012]
Then, as shown in FIG. 14B, the annular corrugated fin 122 is inserted into the outer cylindrical member 123 from the axial direction with the center thereof coincident with the central axis, and temporarily fixed at a predetermined position. In this state, the inner cylindrical member 124 having an outer diameter slightly larger than the inner diameter of the annular corrugated fin 122 is inserted from the axial direction by aligning the center with the center axis of the annular corrugated fin 122, The annular corrugated fins 122 are pressed against the outer cylindrical member 123 side in the radial direction from the inside and fixed.
[0013]
According to this, there is an advantage that a step in which an error in the accuracy of the product such as bonding or welding easily occurs is omitted, so that the heat exchanger 125 having stable performance can be mass-produced. In addition, since the inner cylindrical member 124 is newly provided, the temperature distribution that tends to be biased to a part of the annular corrugated fin 122 during heat exchange is made uniform, which also advantageously acts to stabilize the heat exchange performance. It is considered.
[0014]
[Problems to be solved by the invention]
However, after inserting the linear corrugated fin 121 into the outer cylindrical member 123 after inserting the circular corrugated fin 122 whose shape is maintained by rolling the straight corrugated fin 121 so as to match both ends 121a and 121b, the ends 121a are removed. , 121b are separated and the rounded shape of the annular corrugated fin 122 may not be a perfect circle.
[0015]
In this case, when the inner cylindrical member 124 for crimping the annular corrugated fin 122 is inserted, the crimping force may not be uniformly applied in the radial direction, so that the annular corrugated fin 122 has a distorted shape and has a circumferential shape. Variations occur between dense and sparse fin pitches. As a result, a desired heat exchange performance may not be obtained from the heat exchanger 125.
[0016]
If the annular corrugated fin 122 does not smoothly contact the inner surface of the outer cylindrical member 123, the inner cylindrical member 124 for crimping cannot be inserted smoothly. Furthermore, if the annular corrugated fin 122 is handled as it is, the distance between the fins tends to be uneven due to its own weight, the flow of the working gas becomes uneven, and the heat exchange performance also decreases.
[0017]
Also, if the pressure of the annular corrugated fins 122 pressed against the outer cylindrical member 123 is low, the contact area between the annular corrugated fins 122 that are in linear contact with the sharp projecting portions 122a and the inner surface of the outer cylindrical member 123 is reduced. Cannot be secured sufficiently, and the heat transfer efficiency is poor, leading to deterioration of the performance of the heat exchanger 125.
[0018]
The present invention has been made in view of the above-described conventional problems, and has an object to provide a heat exchanger for a Stirling engine in which productivity is improved and excellent performance is stably obtained. .
[0019]
[Means for Solving the Problems]
In order to achieve the above object, a heat exchanger for a Stirling refrigerator according to the present invention is configured such that a straight corrugated fin in which a V-shaped cross-section is continuously connected is rounded into a cylinder, and one end of the V-shape is inverted V-shaped. An annular corrugated fin connected by engaging the other end of
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
An inner cylindrical member which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and which is inserted into the outer cylindrical member from the axial direction of the annular corrugated fin.
[0020]
In addition, the heat exchanger for a Stirling refrigerator according to the present invention, a linear corrugated fin in which a V-shaped cross-sectional shape is continuously connected is rounded into a cylindrical shape, and one end of the V-shape and the other end of an inverted V-shape are provided. Annular corrugated fins connected by applying spot welding to each other's surfaces,
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
An inner cylindrical member which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and which is inserted into the outer cylindrical member from the axial direction of the annular corrugated fin.
[0021]
In addition, the heat exchanger for a Stirling refrigerator according to the present invention, a linear corrugated fin in which a V-shaped cross-sectional shape is continuously connected is rounded into a cylindrical shape, and one end of the V-shape and the other end of an inverted V-shape are provided. Annular corrugated fins that are connected by applying adhesive to each other,
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
An inner cylindrical member which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and which is inserted into the outer cylindrical member from the axial direction of the annular corrugated fin.
[0022]
In addition, the heat exchanger for a Stirling refrigerator according to the present invention, a linear corrugated fin in which a V-shaped cross-sectional shape is continuously connected is rounded into a cylindrical shape, and one end of the V-shape and the other end of an inverted V-shape are provided. Annular corrugated fins which are connected by applying solder to each other's surfaces,
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
An inner cylindrical member which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and which is inserted into the outer cylindrical member from the axial direction of the annular corrugated fin.
[0023]
Further, the heat exchanger for a Stirling refrigerator according to the present invention, a linear corrugated fin in which a V-shaped cross-sectional shape is continuously connected is rolled into a cylindrical shape, and one end and the other end of the inverted V-shape are connected to each other. An annular corrugated fin that is held in contact with and connected by attaching a joining member having a U-shaped cross section to one end and the other end thereof;
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
An inner cylindrical member which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and which is inserted into the outer cylindrical member from the axial direction of the annular corrugated fin.
[0024]
Further, in the heat exchanger for a Stirling refrigerator according to the present invention, a straight corrugated fin in which a V-shaped cross-sectional shape is continuously connected is rounded into a cylindrical shape, and a notch formed at one end and the other end of the inverted V-shape. Annular corrugated fins which are connected by being inserted into each other so as to cross
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
An inner cylindrical member which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and which is inserted into the outer cylindrical member from the axial direction of the annular corrugated fin.
[0025]
Further, the heat exchanger for a Stirling refrigerator according to the present invention, a linear corrugated fin in which a V-shaped cross-sectional shape is continuously connected is rolled into a cylindrical shape, and one end and the other end of the inverted V-shape are connected to each other. An annular corrugated fin having a convex portion formed by contacting and holding;
A concave portion that fits with the convex portion is provided on the inner surface, and the inner diameter is selected to be substantially equal to the outer diameter of the annular corrugated fin, and the annular corrugated fin is fitted from the axial direction with the fitting of the convex portion and the concave portion. An outer cylindrical member to be inserted;
An inner cylindrical member which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and which is inserted into the outer cylindrical member from the axial direction of the annular corrugated fin.
[0026]
Further, the heat exchanger for a Stirling refrigerator according to the present invention is an annular corrugated fin in which corrugated protruding portions are formed in close contact with each other and are arranged at equal intervals as a whole,
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
An inner cylindrical member which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and which is inserted into the outer cylindrical member from the axial direction of the annular corrugated fin.
[0027]
According to these, while the annular corrugated fins are easily formed, the annular corrugated fins are radially pressed from the center to the outer cylindrical member side by the inner cylindrical member, and have a sufficient contact area to form the outer cylindrical member. It comes into close contact with the inner surface.
[0028]
The outer cylindrical member is provided adjacent to the outer cylindrical member, and has an inclined surface whose inner diameter is substantially equal to the inner diameter of the outer cylindrical member at a joint portion of the outer cylindrical member, and increases continuously toward the opposite side. When the cylindrical corrugated fin into which the inner cylindrical member is inserted in advance from the opposite side of the outer cylindrical member of the introduced member and the cylindrical introducing member having a cross-sectional shape of the inner surface is inserted. Good.
[0029]
According to this, the annular corrugated fins are gradually pushed from a portion having a large inner diameter to a portion having a small inside diameter of the introduction member while being pressed radially outward from the center by the inner cylindrical member.
[0030]
BEST MODE FOR CARRYING OUT THE INVENTION
<First embodiment>
A first embodiment of the present invention will be described with reference to the drawings. 1A and 1B are a part of a manufacturing procedure of a heat exchanger according to the present embodiment, in which FIG. 1A is a plan view of a linear corrugated fin, and FIGS. FIG. 5D is a plan view showing a part of the heat exchanger in an enlarged manner, and FIG.
[0031]
The manufacturing procedure of the heat exchanger according to the present embodiment will be described with reference to FIG. As shown in FIG. 1 (a), one end 1a of the linear corrugated fin 1 whose V-shaped cross-section extends continuously is a V-shaped fin, and the other end 1b is an inverted V-shaped fin. Both ends 1a, 1b are machined shorter than the fin length of the fin between them. The thickness of the linear corrugated fin 1 in the direction perpendicular to the paper surface is selected to be shorter than the axial length of a cylindrical outer cylindrical member 3 described later.
[0032]
Then, as shown by the arrow in FIG. 1A, the linear corrugated fin 1 is rolled into a cylindrical shape so that both ends 1a and 1b are aligned, and one end 1a and the other end 1b are hooked together as shown in FIG. 1B. Thereby, an annular corrugated fin 2 as shown in FIG. 1C is formed.
[0033]
As a result, both ends 1a and 1b of the annular corrugated fin 2 hooked to return to the original linear state are pulled together, and the annular corrugated fin 2 is maintained in the annular shape. Reference numerals 2a and 2b denote protrusions and grooves formed around the annular corrugated fin 2, respectively, and reference numeral 2c denotes a connecting portion thereof.
[0034]
The inner diameter of the cylindrical outer cylindrical member 3 is selected to be substantially equal to the outer diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the protruding portions 2a). Therefore, the annular corrugated fin 2 can be inserted from the axial direction with its center aligned with the central axis of the outer cylindrical member 3. Then, the annular corrugated fin 2 thus inserted into the outer cylindrical member 3 is temporarily fixed so that the front end surface does not shift to a position aligned with the open end of the outer cylindrical member 3.
[0035]
On the other hand, the outer diameter of the cylindrical inner cylindrical member 4 is selected to be slightly larger than the inner diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the grooves 2b). Therefore, the inner cylindrical member 4 can be press-fitted from the axial direction with its center aligned with the central axis of the annular corrugated fin 2. Then, the inner cylindrical member 4 is inserted into the outer cylindrical member 3 as described above and pressed into the temporarily fixed annular corrugated fin 2. Thus, the annular corrugated fin 2 is radially pressed from the inside to the outside cylindrical member 3 side by the periphery of the inside cylindrical member 4, and the heat exchanger 5 as shown in FIG. 1D is completed.
[0036]
Therefore, steps such as bonding and welding of the annular corrugated fins 2 to the outer cylindrical member 3 are omitted, thereby improving productivity. In addition, the annular corrugated fins 2 can be securely fixed by crimping. Since a uniform contact state is obtained over the entire circumference, the heat exchanger 5 having excellent performance can be stably provided.
[0037]
<Second embodiment>
A second embodiment of the present invention will be described with reference to the drawings. 2A and 2B are a part of a manufacturing procedure of the heat exchanger according to the present embodiment. FIG. 2A is a plan view of a linear corrugated fin, and FIGS. FIG. 5D is a plan view showing a part of the heat exchanger in an enlarged manner, and FIG.
[0038]
The manufacturing procedure of the heat exchanger according to the present embodiment will be described with reference to FIG. As shown in FIG. 2A, one end 1a of the linear corrugated fin 1 in which the V-shaped cross-sectional shapes are continuously connected is a V-shaped fin, and the other end 1b is an inverted V-shaped fin. Both ends 1a, 1b are machined shorter than the fin length of the fin between them. The thickness of the linear corrugated fin 1 in the direction perpendicular to the paper surface is selected to be shorter than the axial length of a cylindrical outer cylindrical member 3 described later.
[0039]
Then, as shown by the arrow in FIG. 2A, the linear corrugated fin 1 is rolled into a cylindrical shape so that both ends 1a and 1b are aligned, and as shown in FIG. 2B, one surface of one end 1a and one end 1b is formed. An annular corrugated fin 2 as shown in FIG. 2 (c) is formed by brazing or spot welding the portions and joining them in a contact state. Reference numerals 2a and 2b denote protrusions and grooves formed around the annular corrugated fin 2, respectively, and reference numeral 2d denotes a brazed or welded portion.
[0040]
The inner diameter of the cylindrical outer cylindrical member 3 is selected to be substantially equal to the outer diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the protruding portions 2a). Therefore, the annular corrugated fin 2 can be inserted from the axial direction with its center aligned with the central axis of the outer cylindrical member 3. Then, the annular corrugated fin 2 thus inserted into the outer cylindrical member 3 is temporarily fixed so that the front end surface does not shift to a position aligned with the open end of the outer cylindrical member 3.
[0041]
On the other hand, the outer diameter of the cylindrical inner cylindrical member 4 is selected to be slightly larger than the inner diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the grooves 2b). Therefore, the inner cylindrical member 4 can be press-fitted from the axial direction with its center aligned with the central axis of the annular corrugated fin 2. Then, the inner cylindrical member 4 is inserted into the outer cylindrical member 3 as described above and pressed into the temporarily fixed annular corrugated fin 2. As a result, the annular corrugated fins 2 are radially pressed from the inside to the outside cylindrical member 3 side by the periphery of the inside cylindrical member 4 to complete the heat exchanger 5 as shown in FIG.
[0042]
Therefore, steps such as bonding and welding of the annular corrugated fins 2 to the outer cylindrical member 3 are omitted, thereby improving productivity. In addition, the annular corrugated fins 2 can be securely fixed by crimping. Since a uniform contact state is obtained over the entire circumference, the heat exchanger 5 having excellent performance can be stably provided.
[0043]
<Third embodiment>
A third embodiment of the present invention will be described with reference to the drawings. 3A and 3B are a part of a manufacturing procedure of the heat exchanger according to the present embodiment, in which FIG. 3A is a plan view of a linear corrugated fin, and FIGS. FIG. 5D is a plan view showing a part of the heat exchanger in an enlarged manner, and FIG.
[0044]
The manufacturing procedure of the heat exchanger according to the present embodiment will be described with reference to FIG. As shown in FIG. 3A, one end 1a of a linear corrugated fin 1 in which V-shaped cross-sectional shapes are continuously connected is a V-shaped fin, and the other end 1b is an inverted V-shaped fin. Both ends 1a, 1b are machined shorter than the fin length of the fin between them. The thickness of the linear corrugated fin 1 in the direction perpendicular to the paper surface is selected to be shorter than the axial length of a cylindrical outer cylindrical member 3 described later.
[0045]
Then, as shown by the arrows in FIG. 3A, the straight corrugated fins 1 are joined so that both ends 1a and 1b of which an adhesive 6 such as an instantaneous adhesive (see FIG. Is rounded into a cylindrical shape, and is adhered by holding the application surface of the adhesive 6 at one end 1a and the other end 1b in contact with each other for a while as shown in FIG. The corrugated fin 2 is formed. Reference numerals 2a and 2b denote projections and grooves formed around the annular corrugated fin 2, respectively, and reference numeral 2e denotes an adhesive portion thereof.
[0046]
The inner diameter of the cylindrical outer cylindrical member 3 is selected to be substantially equal to the outer diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the protruding portions 2a). Therefore, the annular corrugated fin 2 can be inserted from the axial direction with its center aligned with the central axis of the outer cylindrical member 3. Then, the annular corrugated fin 2 thus inserted into the outer cylindrical member 3 is temporarily fixed so that the front end surface does not shift to a position aligned with the open end of the outer cylindrical member 3.
[0047]
On the other hand, the outer diameter of the cylindrical inner cylindrical member 4 is selected to be slightly larger than the inner diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the grooves 2b). Therefore, the inner cylindrical member 4 can be press-fitted from the axial direction with its center aligned with the central axis of the annular corrugated fin 2. Then, the inner cylindrical member 4 is inserted into the outer cylindrical member 3 as described above and pressed into the temporarily fixed annular corrugated fin 2. As a result, the annular corrugated fins 2 are radially pressed from the inside to the outside cylindrical member 3 side by the periphery of the inside cylindrical member 4, and the heat exchanger 5 as shown in FIG. 3D is completed.
[0048]
Therefore, steps such as bonding and welding of the annular corrugated fins 2 to the outer cylindrical member 3 are omitted, thereby improving productivity. In addition, the annular corrugated fins 2 can be securely fixed by crimping. Since a uniform contact state is obtained over the entire circumference, the heat exchanger 5 having excellent performance can be stably provided.
[0049]
<Fourth embodiment>
A fourth embodiment of the present invention will be described with reference to the drawings. 4A and 4B are a part of a manufacturing procedure of the heat exchanger according to the present embodiment. FIG. 4A is a plan view of a linear corrugated fin, and FIGS. FIG. 5D is a plan view showing a part of the heat exchanger in an enlarged manner, and FIG.
[0050]
The manufacturing procedure of the heat exchanger according to the present embodiment will be described with reference to FIG. As shown in FIG. 4A, one end 1a of a linear corrugated fin 1 in which V-shaped cross-sectional shapes are continuously connected is a V-shaped fin, and the other end 1b is an inverted V-shaped fin. Both ends 1a, 1b are machined shorter than the fin length of the fin between them. The thickness of the linear corrugated fin 1 in the direction perpendicular to the paper surface is selected to be shorter than the axial length of a cylindrical outer cylindrical member 3 described later.
[0051]
Then, as shown by the arrow in FIG. 4 (a), the straight corrugated fin 1 is formed in a cylindrical shape so that both ends 1a and 1b of which the paste-like solder 7 (see FIG. As shown in FIG. 4 (b), soldering is performed by heating for a while in a state where the application surfaces of the solder 7 at one end 1a and the other end 1b are in contact with each other, and the annular corrugated fin 2 as shown in FIG. To form Reference numerals 2a and 2b denote protrusions and grooves formed around the annular corrugated fin 2, respectively, and reference numeral 2f denotes a soldered portion thereof.
[0052]
The inner diameter of the cylindrical outer cylindrical member 3 is selected to be substantially equal to the outer diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the protruding portions 2a). Therefore, the annular corrugated fin 2 can be inserted from the axial direction with its center aligned with the central axis of the outer cylindrical member 3. Then, the annular corrugated fin 2 thus inserted into the outer cylindrical member 3 is temporarily fixed so that the front end surface does not shift to a position aligned with the open end of the outer cylindrical member 3.
[0053]
On the other hand, the outer diameter of the cylindrical inner cylindrical member 4 is selected to be slightly larger than the inner diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the grooves 2b). Therefore, the inner cylindrical member 4 can be press-fitted from the axial direction with its center aligned with the central axis of the annular corrugated fin 2. Then, the inner cylindrical member 4 is inserted into the outer cylindrical member 3 as described above and pressed into the temporarily fixed annular corrugated fin 2. Thus, the annular corrugated fins 2 are radially pressed from the inside to the outside cylindrical member 3 side by the periphery of the inside cylindrical member 4, and the heat exchanger 5 as shown in FIG. 4D is completed.
[0054]
Therefore, steps such as bonding and welding of the annular corrugated fins 2 to the outer cylindrical member 3 are omitted, thereby improving productivity. In addition, the annular corrugated fins 2 can be securely fixed by crimping. Since a uniform contact state is obtained over the entire circumference, the heat exchanger 5 having excellent performance can be stably provided.
[0055]
<Fifth embodiment>
A fifth embodiment of the present invention will be described with reference to the drawings. 5A and 5B are a part of a manufacturing procedure of the heat exchanger according to the present embodiment, in which FIG. 5A is a plan view of a linear corrugated fin, and FIGS. FIG. 5D is a plan view showing a part of the heat exchanger in an enlarged manner, and FIG.
[0056]
The manufacturing procedure of the heat exchanger according to the present embodiment will be described with reference to FIG. As shown in FIG. 5A, one end 1a and the other end 1b of the linear corrugated fin 1 in which the V-shaped cross-sections are continuously connected are inverted V-shaped fins, and both ends 1a and 1b are located between them. The fin is shorter than the fin length. The thickness of the linear corrugated fin 1 in the direction perpendicular to the paper surface is selected to be shorter than the axial length of a cylindrical outer cylindrical member 3 described later.
[0057]
Then, as shown by the arrow in FIG. 5A, the linear corrugated fin 1 is rolled into a cylindrical shape so that both ends 1a and 1b are aligned, and one end 1a and the other end 1b are brought into contact with each other as shown in FIG. 5B. Are held in contact with each other, and are connected by a joining member 8 having a U-shaped cross section made of a material having high elasticity, thereby forming an annular corrugated fin 2 as shown in FIG. 5C. Reference numerals 2a and 2b denote protrusions and grooves formed around the annular corrugated fin 2, respectively.
[0058]
The inner diameter of the cylindrical outer cylindrical member 3 is selected to be substantially equal to the outer diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the protruding portions 2a). Therefore, the annular corrugated fin 2 can be inserted from the axial direction with its center aligned with the central axis of the outer cylindrical member 3. Then, the annular corrugated fin 2 thus inserted into the outer cylindrical member 3 is temporarily fixed so that the front end surface does not shift to a position aligned with the open end of the outer cylindrical member 3.
[0059]
On the other hand, the outer diameter of the cylindrical inner cylindrical member 4 is selected to be slightly larger than the inner diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the grooves 2b). Therefore, the inner cylindrical member 4 can be press-fitted from the axial direction with its center aligned with the central axis of the annular corrugated fin 2. Then, the inner cylindrical member 4 is inserted into the outer cylindrical member 3 as described above and pressed into the temporarily fixed annular corrugated fin 2. As a result, the annular corrugated fins 2 are radially pressed from the inside to the outside cylindrical member 3 side by the periphery of the inside cylindrical member 4, and the heat exchanger 5 as shown in FIG. 5D is completed.
[0060]
Therefore, steps such as bonding and welding of the annular corrugated fins 2 to the outer cylindrical member 3 are omitted, thereby improving productivity. In addition, the annular corrugated fins 2 can be securely fixed by crimping. Since a uniform contact state is obtained over the entire circumference, the heat exchanger 5 having excellent performance can be stably provided.
[0061]
<Sixth embodiment>
A sixth embodiment of the present invention will be described with reference to the drawings. 6A and 6B are a part of a manufacturing procedure of the heat exchanger according to the present embodiment, wherein FIG. 6A is a plan view of a linear corrugated fin, FIG. 6B is a plan view of an annular corrugated fin, and FIG. Is a plan view of a state in which is inserted into the outer cylindrical member, and (d) is a plan view of the completed heat exchanger.
[0062]
The manufacturing procedure of the heat exchanger according to the present embodiment will be described with reference to FIG. As shown in FIG. 6A, one end 1a and the other end 1b of the linear corrugated fin 1 in which the V-shaped cross-sections are continuously connected are inverted V-shaped fins, and both ends 1a and 1b are located between them. The fin is machined longer than the fin length. The thickness of the linear corrugated fin 1 in the direction perpendicular to the paper surface is selected to be shorter than the axial length of a cylindrical outer cylindrical member 3 described later.
[0063]
Then, as shown by an arrow in FIG. 6A, the linear corrugated fin 1 is rolled into a cylindrical shape so that both ends 1a and 1b are aligned, and as shown in FIG. Are kept in contact with each other. Reference numerals 2a and 2b denote protrusions and grooves formed around the annular corrugated fin 2, respectively. As a result, both ends 1a and 1b form projections 2g that project in the radial direction from the outer diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the projections 2a).
[0064]
The inner diameter of the cylindrical outer cylindrical member 3 is selected to be substantially equal to the outer diameter of the annular corrugated fin 2. Further, a concave portion 3a in which the convex portion 2g of the annular corrugated fin 2 is fitted is provided at one position on the inner surface of the outer heat exchanger 3 so as to extend in the axial direction. Accordingly, the annular corrugated fin 2 can be inserted from the axial direction by fitting the center of the annular corrugated fin 2 to the central axis of the outer cylindrical member 3 and fitting the convex portion 2g to the concave portion 3a of the outer cylindrical member 3. Then, as shown in FIG. 6 (c), the annular corrugated fin 2 is inserted until the distal end surface thereof is aligned with the open end of the outer cylindrical member 3.
[0065]
At this time, a force to return to the original linear corrugated fin 1 is applied to both ends 1a and 1b of the convex portion 2g, but the movement of the convex portion 2g is restricted to the concave portion 3a. The force is changed to a force in which the annular corrugated fin 2 tries to spread in the radial direction. Therefore, the annular corrugated fin 2 can be temporarily fixed to the outer cylindrical member 3 while being left.
[0066]
On the other hand, the outer diameter of the cylindrical inner cylindrical member 4 is selected to be slightly larger than the inner diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the grooves 2b). Therefore, the inner cylindrical member 4 can be press-fitted from the axial direction with its center aligned with the central axis of the annular corrugated fin 2. Then, the inner cylindrical member 4 is inserted into the outer cylindrical member 3 as described above and pressed into the temporarily fixed annular corrugated fin 2. Thus, the annular corrugated fins 2 are radially pressed from the inside to the outside cylindrical member 3 side by the periphery of the inside cylindrical member 4, and the heat exchanger 5 as shown in FIG. 6D is completed.
[0067]
Therefore, steps such as bonding and welding of the annular corrugated fins 2 to the outer cylindrical member 3 are omitted, thereby improving productivity. In addition, the annular corrugated fins 2 can be securely fixed by crimping. Since a uniform contact state is obtained over the entire circumference, the heat exchanger 5 having excellent performance can be stably provided.
[0068]
<Seventh embodiment>
A seventh embodiment of the present invention will be described with reference to the drawings. 7A and 7B are a part of a manufacturing procedure of the heat exchanger according to the present embodiment, in which FIG. 7A is a plan view of a linear corrugated fin, and FIGS. FIG. 5D is a plan view showing a part of the heat exchanger in an enlarged manner, and FIG. FIG. 8 is a perspective view of FIG.
[0069]
The manufacturing procedure of the heat exchanger according to the present embodiment will be described with reference to FIGS. As shown in FIG. 7 (a), one end 1a and the other end 1b of a linear corrugated fin 1 in which V-shaped cross-sections are continuously connected are inverted V-shaped fins, and both ends 1a and 1b are located between them. The fin is shorter than the fin length.
[0070]
The one end 1a and the other end 1b of the linear corrugated fin 1 are respectively provided with cuts 9 (see FIG. 8) extending from one end surface to the other end surface side and from the other end surface to the one end surface side. The thickness of the linear corrugated fin 1 in the direction perpendicular to the paper surface is selected to be shorter than the axial length of a cylindrical outer cylindrical member 3 described later.
[0071]
Then, as shown by the arrow in FIG. 7A, the linear corrugated fin 1 is rounded into a cylindrical shape so that both ends 1a and 1b are aligned, and one end 1a and the other end 1b are connected as shown in FIGS. 7B and 8. An annular corrugated fin 2 as shown in FIG. 7C is formed by connecting one of the cuts 9 alternately so as to fit the other cut 9. Reference numerals 2a and 2b denote protrusions and grooves formed around the annular corrugated fin 2, respectively.
[0072]
The inner diameter of the cylindrical outer cylindrical member 3 is selected to be substantially equal to the outer diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the protruding portions 2a). Therefore, the annular corrugated fin 2 can be inserted from the axial direction with its center aligned with the central axis of the outer cylindrical member 3. Then, the annular corrugated fin 2 thus inserted into the outer cylindrical member 3 is temporarily fixed so that the front end surface does not shift to a position aligned with the open end of the outer cylindrical member 3.
[0073]
On the other hand, the outer diameter of the cylindrical inner cylindrical member 4 is selected to be slightly larger than the inner diameter of the annular corrugated fin 2 (diameter of a circle formed by smoothly connecting the grooves 2b). Therefore, the inner cylindrical member 4 can be press-fitted from the axial direction with its center aligned with the central axis of the annular corrugated fin 2. Then, the inner cylindrical member 4 is inserted into the outer cylindrical member 3 as described above and pressed into the temporarily fixed annular corrugated fin 2. Thus, the annular corrugated fins 2 are radially pressed from the inside to the outside cylindrical member 3 side by the periphery of the inside cylindrical member 4, and the heat exchanger 5 as shown in FIG. 7D is completed.
[0074]
Therefore, steps such as bonding and welding of the annular corrugated fins 2 to the outer cylindrical member 3 are omitted, thereby improving productivity. In addition, the annular corrugated fins 2 can be securely fixed by crimping. Since a uniform contact state is obtained over the entire circumference, the heat exchanger 5 having excellent performance can be stably provided.
[0075]
<Eighth embodiment>
An eighth embodiment of the present invention will be described with reference to the drawings. 9A and 9B are a part of a manufacturing procedure of the heat exchanger according to the present embodiment, wherein FIG. 9A is a plan view of an annular corrugated fin, FIG. 9B is a plan view of an outer cylindrical member, and FIG. FIG. 5 is a plan view showing a state where the is inserted into the outer cylindrical member.
[0076]
The procedure for manufacturing the heat exchanger will be described with reference to FIG. On the outer peripheral portion of the annular corrugated fin 2, a rounded protruding portion 2h is formed, and the adjacent protruding portions 2h are in close contact with each other to form a corrugated protruding portion 2h arranged at equal intervals as a whole. On the other hand, the outer cylindrical member 3 is formed by pouring a molten metal into a mold and solidifying the same, and has wavy grooves 10 extending in the axial direction at equal intervals around the entire outer periphery of the inner surface thereof. .
[0077]
The groove 10 has a shape in which the projecting portion 2h of the annular corrugated fin 2 fits. Therefore, the center of the annular corrugated fin 2 can be inserted from the axial direction in accordance with the central axis of the outer cylindrical member 3. As described above, when the annular corrugated fin 2 is inserted into the cylindrical member 3, the projecting portion 2h and the groove 10 are fitted to each other, so that positional displacement along the circumferential direction is prevented. Then, the front end surface is temporarily fixed so as not to be shifted to a position aligned with the open end of the outer cylindrical member 3.
[0078]
Furthermore, a cylindrical inner cylindrical member 4 (not shown) having an outer diameter slightly larger than the inner diameter of the annular corrugated fin 2 is inserted into the outer cylindrical member 3 and temporarily fixed. Press in from the axial direction. As a result, the annular corrugated fins 2 are radially pressed from the inside toward the outside cylindrical member 3 by the periphery of the inside cylindrical member 4, and the heat exchanger 5 (not shown) is completed.
[0079]
Therefore, according to the present embodiment, the annular corrugated fin 2 is firmly adhered to the inner surface of the outer cylindrical member 3 and a sufficient contact area is secured over the entire periphery of the annular corrugated fin 2, so that the performance is excellent. The heat exchanger 5 can be provided stably.
[0080]
<Ninth embodiment>
A ninth embodiment of the present invention will be described with reference to the drawings. 10A and 10B are a part of a manufacturing procedure of the heat exchanger according to the present embodiment, in which FIG. 10A is a cross-sectional view before inserting the annular corrugated fin from the introduction member side, and FIG. 10B is a cross-sectional view after the insertion. It is. FIG. 11 is an enlarged plan view showing the vicinity of the side surface of the heat exchanger.
[0081]
As shown in FIGS. 10A and 10B, the cylindrical outer cylindrical member 3 is fixed to the jig 12 together with the introduction member 11 so that the axial direction thereof is substantially horizontal. The introduction member 11 provided adjacent to the outer cylindrical member 3 has an outer diameter substantially equal to that of the outer cylindrical member 3, the inner diameter of which is substantially equal to the inner diameter of the outer cylindrical member 3 at the joint portion, and the opposite side. , The inner surface has a cross-sectional shape having an inclined surface 11a that continuously increases.
[0082]
Hereinafter, the manufacturing procedure of the heat exchanger according to the present embodiment will be described with reference to FIG. As the annular corrugated fins 2, the annular corrugated fins 2 (see FIGS. 1 to 7) formed from a straight line into an annular shape as described in the first to seventh embodiments are used as they are. The annular corrugated fins 2 are formed of a highly flexible material that is easily deformed by an external force.
[0083]
An inner cylindrical member 4 having an outer diameter slightly larger than the inner diameter of the annular corrugated fin 2 is fitted into the annular corrugated fin 2 from the axial direction. Then, in this state, as shown in FIG. 10A, the annular corrugated fins 2 are inserted in the axial direction from the opposite side of the outer cylindrical member 3 of the introduction member 11. As a result, the annular corrugated fin 2 is gradually pushed from a portion having a large inner diameter to a portion having a small inner diameter along the inclined surface 11a of the introduction member 11 while being pressed radially from the center to the outside by the inner cylindrical member 4. It becomes.
[0084]
Then, as shown in FIG. 10B, the press-fitting is completed when the distal end surface of the annular corrugated fin 2 reaches the joint between the outer cylindrical member 3 and the introducing member 11. As a result, the protruding portion 2b of the annular corrugated fin 2 rubs against the inner surface of the introduction member 11, and the shape of the protruding portion 2b changes from an arc shape to a flat shape. Due to this deformation, the contact area between the annular corrugated fin 2 and the inner surface of the outer cylindrical member 3 is increased as shown in FIG.
[0085]
This effect remarkably appears when the hardness of the material of the introduction member 11 is larger than the hardness of the material of the annular corrugated fin 2. Therefore, a sufficient contact area with the inner surface of the outer cylindrical member 3 is ensured, and the heat exchange efficiency of the heat exchanger 5 is improved.
[0086]
【The invention's effect】
As described above, according to the present invention, steps such as bonding and welding of the annular corrugated fin to the outer cylindrical member are omitted, and productivity is improved, and the annular corrugated fin can be securely fixed by crimping, and Since a uniform contact state is obtained over the entire circumference of the annular corrugated fin, a heat exchanger having excellent performance can be provided stably.
[Brief description of the drawings]
FIG. 1 is a part of a manufacturing procedure of a heat exchanger according to a first embodiment of the present invention, in which (a) is a plan view of a linear corrugated fin, and (b) and (c) are annular corrugated fins. FIG. 7 is a plan view showing a part of the completed heat exchanger in a partially enlarged form in a forming step, and FIG.
FIGS. 2A and 2B are a part of a manufacturing procedure of a heat exchanger according to a second embodiment of the present invention, wherein FIG. 2A is a plan view of a linear corrugated fin, and FIGS. FIG. 7 is a plan view showing a part of the completed heat exchanger in a partially enlarged form in a forming step, and FIG.
3A and 3B are a part of a manufacturing procedure of a heat exchanger according to a third embodiment of the present invention, wherein FIG. 3A is a plan view of a linear corrugated fin, and FIGS. FIG. 7 is a plan view showing a part of the completed heat exchanger in a partially enlarged form in a forming step, and FIG.
FIG. 4 is a part of a manufacturing procedure of a heat exchanger according to a fourth embodiment of the present invention, wherein (a) is a plan view of a linear corrugated fin, and (b) and (c) are annular corrugated fins. FIG. 7 is a plan view showing a part of the completed heat exchanger in a partially enlarged form in a forming step, and FIG.
5A and 5B are a part of a manufacturing procedure of a heat exchanger according to a fifth embodiment of the present invention, wherein FIG. 5A is a plan view of a linear corrugated fin, and FIGS. FIG. 7 is a plan view showing a part of the completed heat exchanger in a partially enlarged form in a forming step, and FIG.
FIGS. 6A and 6B are a part of a manufacturing procedure of the heat exchanger according to the sixth embodiment of the present invention, wherein FIG. 6A is a plan view of a linear corrugated fin, FIG. (c) is a plan view of the state where the annular corrugated fin is inserted into the outer cylindrical member, and (d) is a plan view of the completed heat exchanger.
7A and 7B are a part of a manufacturing procedure of a heat exchanger according to a seventh embodiment of the present invention, wherein FIG. 7A is a plan view of a linear corrugated fin, and FIGS. FIG. 7 is a plan view showing a part of the completed heat exchanger in a partially enlarged form in a forming step, and FIG.
FIG. 8 is a perspective view of FIG. 7 (b).
9A and 9B are a part of a manufacturing procedure of a heat exchanger according to an eighth embodiment of the present invention, wherein FIG. 9A is a plan view of an annular corrugated fin, FIG. 9B is a plan view of an outer cylindrical member, (c) is a plan view showing a state where the annular corrugated fin is inserted into the outer cylindrical member.
10A and 10B are a part of a manufacturing procedure of a heat exchanger according to a ninth embodiment of the present invention, in which FIG. 10A is a cross-sectional view before inserting an annular corrugated fin from an introduction member side, and FIG. It is sectional drawing after insertion.
FIG. 11 is an enlarged plan view showing the vicinity of the side surface of the heat exchanger.
FIG. 12 is a schematic sectional view showing a configuration of an example of a conventional Stirling engine.
FIG. 13 is a perspective view (a) of a heat-dissipating heat exchanger incorporated in the engine and plan views (b) and (c) showing the vicinity of a side surface thereof in an enlarged manner.
14 (a) is a plan view of a linear corrugated fin, FIG. 14 (b) is a plan view of an annular corrugated fin, and FIG. 14 (c) is an annular shape. FIG. 4 is a plan view showing a state where the corrugated fin is inserted into the outer cylindrical member, and FIG. 4D is a plan view of the completed heat exchanger.
[Explanation of symbols]
1 Straight corrugated fin
2 annular corrugated fin
3 Outer cylindrical member
4 Inside cylindrical member
5 heat exchanger
6 adhesive
7 Solder
8 Joining members
9 Notch
10 groove
11 Introduction material
12 jig

Claims

An annular corrugated fin formed by rolling a straight corrugated fin having a V-shaped cross-section connected continuously and cylindrically connecting both ends ;
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
A heat exchanger for a Stirling refrigerator including an inner cylindrical member inserted into the outer cylindrical member, which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and inserted into the outer cylindrical member.

A straight corrugated fin having a V-shaped cross-section connected continuously is rounded into a cylindrical shape, and one end of the V-shape and the other end of the inverted V-shape are connected by spot welding to each other's surfaces. Annular corrugated fins,
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
A heat exchanger for a Stirling refrigerator including an inner cylindrical member inserted into the outer cylindrical member, which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and inserted into the outer cylindrical member.

A straight corrugated fin in which V-shaped cross-sections are continuously connected is rounded into a cylindrical shape, and one end of the V-shape and the other end of the inverted V-shape are connected to each other by bonding them to each other's surfaces. Annular corrugated fins,
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
A heat exchanger for a Stirling refrigerator including an inner cylindrical member inserted into the outer cylindrical member, which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and inserted into the outer cylindrical member.

A straight corrugated fin with a V-shaped cross-section connected continuously is rolled into a cylindrical shape, and one end of the V-shape and the other end of the inverted V-shape are connected by soldering to each other's surfaces. Annular corrugated fins,
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
A heat exchanger for a Stirling refrigerator including an inner cylindrical member inserted into the outer cylindrical member, which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and inserted into the outer cylindrical member.

A straight corrugated fin in which a V-shaped cross section is continuously connected is rounded into a cylindrical shape, and one end and the other end of the inverted V-shape are held in contact with each other's surfaces, and the one end and the other end are An annular corrugated fin connected by mounting a joining member having a U-shaped cross section,
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
A heat exchanger for a Stirling refrigerator including an inner cylindrical member inserted into the outer cylindrical member, which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and inserted into the outer cylindrical member.

A straight corrugated fin having a V-shaped cross-section connected continuously is rounded into a cylindrical shape, and the corrugated fins are connected to each other so as to intersect the notches formed at one end and the other end of the inverted V-shape. Annular corrugated fins,
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
A heat exchanger for a Stirling refrigerator including an inner cylindrical member inserted into the outer cylindrical member, which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and inserted into the outer cylindrical member.

An annular corrugate having a convex portion formed by rolling a straight corrugated fin having a V-shaped cross-section that is continuously connected into a cylindrical shape, and holding one end and the other end of the inverted V-shape in contact with each other's surfaces. With fins,
A concave portion that fits with the convex portion is provided on the inner surface, and the inner diameter is selected to be substantially equal to the outer diameter of the annular corrugated fin, and the annular corrugated fin is fitted from the axial direction with the fitting of the convex portion and the concave portion. An outer cylindrical member to be inserted;
A heat exchanger for a Stirling refrigerator including an inner cylindrical member inserted into the outer cylindrical member, which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and inserted into the outer cylindrical member.

An annular corrugated fin in which corrugated protruding portions which are in close contact with each other and are arranged at equal intervals as a whole are formed around;
An outer cylindrical member into which the annular corrugated fin is selected to have an inner diameter substantially equal to the outer diameter of the annular corrugated fin, and into which the annular corrugated fin is inserted in the axial direction;
A heat exchanger for a Stirling refrigerator including an inner cylindrical member inserted into the outer cylindrical member, which is selected to have an outer diameter slightly larger than the inner diameter of the annular corrugated fin and inserted into the outer cylindrical member.

An inner surface which is disposed adjacent to the outer cylindrical member, and has an inner surface whose inner diameter is substantially equal to the inner diameter of the outer cylindrical member at a joint portion of the outer cylindrical member, and which continuously increases toward the opposite side. 2. A cylindrical introduction member having a cross-sectional shape defined by a circle, and the annular corrugated fin into which the inner cylindrical member has been inserted in advance from the opposite side of the introduction member from the outer cylindrical member. A method for producing a heat exchanger for a Stirling refrigerator according to any one of claims 1 to 7.