JP4456777B2

JP4456777B2 - Heat exchanger

Info

Publication number: JP4456777B2
Application number: JP2001149639A
Authority: JP
Inventors: 洋一宮崎; 博志山口
Original assignee: Japan Climate Systems Corp
Current assignee: Japan Climate Systems Corp
Priority date: 2001-05-18
Filing date: 2001-05-18
Publication date: 2010-04-28
Anticipated expiration: 2021-05-18
Also published as: JP2002340443A

Description

【０００１】
【発明の属する技術分野】
本発明は、冷媒蒸発を行なう冷媒通路を有する熱交換ユニットを少なくとも２ユニット連接して構成される熱交換器に関するものである。
【０００２】
【従来の技術】
従来、特開平０９−１７０８５０号公報に見られるような熱交換器が知られている。この熱交換器は、図１４に示すように、熱交換ユニットは上下両端部にタンク部を配置しており、かつ風下側及び風上側に積層配置されている。
【０００３】
この熱交換器では、風下側熱交換器１０２の下部タンク部の中央部分に仕切部１１１が設けられ、第１下部タンク１０７ａ及び第２下部タンク１０７ｂに区分されている。同様に風上側熱交換器の上部タンク部の中央部分に仕切部１１０が設けられ、第１上部タンク１０８ａ及び第２上タンク１０８ｂに区分されている。第２下部タンク１０７ｂと第２上部タンク１０８ｂとが連通路１１２で連通されている。第１下部タンク１０７ａに冷媒の入口部１１４が設けられ、第１上部タンク部１０８ａに出口部１１５が設けられている。
【０００４】
この熱交換器では、冷媒は入口部１１４から第１下部タンク１０７ａに入り、チューブ内の冷媒通路を上昇して上部タンク１０６に導かれる。そして、この上部タンク１０６内を長手方向に通流し冷媒通路を下降して第２下部タンク１０７ｂに至る。さらに、冷媒は、連通路１１２を介して第２上部タンク１０８ｂに導かれ、そこから冷媒通路を下降して下部タンク１０９に導かれ、この下部タンク１０９内を長手方向に通流し冷媒通路を上昇して第１上部タンク１０８ａに至り、この第１上部タンク１０８ａの出口部１１５から流出する。
【０００５】
【発明が解決しようとする課題】
特開平０９−１７０８５０号のものでは、気液２相冷媒の液相冷媒と気相冷媒が入口部１１４から第１下部タンク１０７ａに入り、チューブ内の風下側冷媒通路を上昇して上部タンク１０６に導かれる。その時、図１５に示すように、軽い気相冷媒が冷媒通路の中央上方部分に溜まる傾向になる。そして、通常冷媒は上タンク１０６内を長手方向に通流し冷媒通路を下降して第２下部タンク１０７ｂに至るが、上タンク内１０６を長手方向に通流する際に、比較的重い液相冷媒は通流慣性により長手方向奥まで導かれ、その結果、気相冷媒が冷媒通路の中央下方部分に溜まる傾向になる。風上側熱交換ユニットでも同様なことが発生する。
【０００６】
このように気相冷媒が熱交換ユニットの一部に集中して停滞しまうために、均一な流れができず、均等な熱分布が得られず、熱交換ユニットでの熱交換が十分に行なわれない。そのために、熱交換ユニット数を増やして、冷媒通路の経路長を長くすることが考えられる。そのようにすれば、熱交換ユニットの総容量が大きくなり、スペースの問題が発生する。また、熱交換ユニットを細分化して熱交換ユニット数を増加する、所謂多パス化することも考えられるが、冷媒通路の経路長が長くなり、流通抵抗が増加し圧損が大きくなる。
【０００７】
特に、液相冷媒と気相冷媒とが混在して、熱交換ユニット内を下方に通流し、そこからＵターンして上昇するタイプでは、上昇する冷媒通路内で液相冷媒と気相冷媒との分布が拡大し、温度分布の差が増大し、熱交換能力が低下する。それとともに、偏った液相冷媒は蒸発効率が悪く、そのまま熱効果ユニットの出口部から排出されるので、冷媒循環量が減少し、冷房能力が低下する。
【０００８】
本発明は、上記した従来技術の問題点を解消することを狙いとし、特に熱交換ユニットに２相冷媒の液相冷媒と気相冷媒が導入されても、熱交換効果を十分に発揮できる熱交換器を提供するものである。特に、熱交換ユニット内での気相冷媒と液相冷媒の通流状況を考慮し、熱交換ユニット内での気相冷媒の通流をできるだけ少なくし、気相冷媒が熱交換ユニットの冷媒通路内で停滞或は発生を少なくするものである。
【０００９】
【課題を解決するための手段】
請求項１の発明は、
上下一対のタンク部と、これらタンク部間に連結された複数のチューブと、該チューブ間にフィンを配設して構成された熱交換ユニットを２ユニット備え、各熱交換ユニットのタンク部を連通して構成される熱交換器において、
第１熱交換ユニットの上部タンク部と第２熱交換ユニットの上部タンク部とが仕切部材で仕切られ、第１熱交換ユニットの下部タンク部と第２熱交換ユニットの下部タンク部とが連通され、
第２熱交換ユニットの上部タンク部を仕切部材に近いサイドと遠いサイドとに２つに分離する分離壁が設けられ、上記仕切部材から遠いサイドの第１分割タンク部に第１出口部が設けられ、上記仕切部材に近いサイドの第２分割タンク部に第２出口部が設けられ、
第１熱交換ユニットの上部タンク部に冷媒を供給する入口部が設けられ、
第１熱交換ユニットの上部タンク部に導入された冷媒が、第１熱交換ユニットのチューブ内を下降して下部タンク部に導かれ、そこから第２熱交換ユニットの下部タンク部に導かれ、さらに第２熱交換ユニットのチューブ内を上昇して、上記両第１及び第２分割タンク部に導かれ、それぞれの第１及び第２出口部から排出されるように構成されている。
【００１０】
この構成では、気相冷媒の多い冷媒を、第２熱交換ユニットの上部タンク部で分離できるので、熱交換ユニット内での気相冷媒の発生を低減でき、液相冷媒の偏りを少なくでき、熱交換機能を向上できる。
【００１１】
請求項２の発明は、請求項１の熱交換器において、
上記第１熱交換ユニット及び上記第２熱交換ユニットが並置され、この第１及び第２熱交換ユニットからなるセットが２セット以上設けられ、第１セットの第１分割タンク部の第１出口部が、第２セットの第１熱交換ユニットとの上部タンク部に接続され、第１セットの第１分割タンク部の冷媒が第２セットの熱交換ユニットに導かれ、第１セットの第２分割タンク部の第２出口部が、第２セットの熱交換ユニットをバイパスして設けられていることを特徴とする。
【００１２】
この構成では、第２セットの熱交換ユニットへの気相冷媒の導入が極減できるので、第２セットの熱交換ユニットでの冷媒の流速が相対的に遅くなり、分流の偏りも減少する。
【００１３】
請求項３の発明は、請求項２記載の熱交換器において、第１セットの第２分割タンク部の第２出口部と、第２セットの第２分割タンク部の第２出口部とが連通されて、第１セット及び第２セットの熱交換ユニットの外部に接続されている構成であり、管路を比較的コンパクトに配設できる。
【００１４】
請求項４の発明は、請求項２記載の熱交換器において、第１セットの第２分割タンク部の第２出口部と、第２セットの第２分割タンク部の第２出口部とが連通されて、熱交換器の最終熱交換ユニットの最終タンクに接続されているので、蒸発が不十分な冷媒であってもこの最終タンク部で蒸発が促進され、液相冷媒の流出を防止できる。
【００１５】
請求項５の発明は、請求項２記載の熱交換器において、第１セットの第２分割タンク部の第２出口部と、第２セットの第２分割タンク部の第２出口部とがお互いの上部タンク内に設けられた連結パイプで接続されているので、熱交換ユニットの総容量を増やすことなく、管路を設けることができ、スペース効率が向上する。
【００１６】
請求項６の発明は、請求項５記載の熱交換器において、上記連結パイプが第１セットの第１分割タンク部内を貫通する部分に、管内断面積よりも拡大した断面積からなる拡大部を設け、該拡大部に第１分割タンク部に開口する開口部を設けたので、該連結パイプ内での液相冷媒と気相冷媒との分離が促進され、この液相冷媒が第１分割タンク部に戻され、熱交換能力が向上する。
【００１７】
請求項７の発明は、請求項５又は６記載の熱交換器において、上記連結パイプが第１セットの第１分割タンク部内を貫通する部分に、上記連結パイプ管内を通過する冷媒が螺旋状に通流する螺旋流通部を設けた構成であり、連結パイプ内での液相冷媒と気相冷媒との分離が促進され、液相冷媒鋳が積極的に熱交換ユニットに戻されるので、冷媒の通流偏りが少なくなり、通流分布が改善され、熱交換能力が向上する。
【００１８】
請求項８の発明は、請求項２記載の熱交換器において、第１セットの第２分割タンク部の第２出口部と、第２セットの第２分割タンク部の第２出口部とがお互いの上部タンクの外壁に接して設けられた連結パイプで接続されているので、該連結パイプ内での液相冷媒と気相冷媒との分離が促進され、この液相冷媒が第１分割タンク部に戻され、熱交換能力が向上する。
【００１９】
請求項９の発明は、請求項８記載の熱交換器において、上記連結パイプが第１セットの第１分割タンク部と背中合わせになる部分に、管内断面積よりも拡大した断面積からなる拡大部を設け、該拡大部に第１分割タンク部に開口する開口部を設けので、該連結パイプ内での液相冷媒と気相冷媒との分離が促進され、この液相冷媒が第１分割タンク部に戻され、熱交換能力が向上する。
【００２０】
請求項１０の発明は、請求項８又は９記載の熱交換器において、上記連結パイプが第１セットの第１分割タンク部と背中合わせになる部分に、上記連結パイプ管内を通過する冷媒が螺旋状に通流する螺旋流通部を設けた構成であり、連結パイプ内での液相冷媒と気相冷媒との分離が促進され、液相冷媒鋳が積極的に熱交換ユニットに戻されるので、冷媒の通流偏りが少なくなり、通流分布が改善され、熱交換能力が向上する。
【００２１】
【発明の実施の形態】
以下に、本発明の第１実施例を図面に基づいて説明する。図１ないし図４は第１実施例の熱交換器１を示す。図１に示すように、熱交換器１は風向きＡで示されるように、風下側熱交換ユニット２、風上側熱交換ユニット３からなる。風下側熱交換ユニット２及び風上側熱交換ユニット３はそれぞれ、複数のチューブ４と放熱用の波状フィン５が交互に積層され、この積層されたチューブ４及び波状フィン５の上下に設けられたタンク部６、７及び８、９とから構成されている。
【００２２】
この第１実施例では図２に示すように、風下側熱交換ユニット２の上部タンク６および風上側熱交換ユニット３の上部タンク８に、それぞれ、仕切部材１０、１１が設けられて、上部タンク６が上部第１タンク６a、上部第２タンク６ｂに、上部タンク８が上部第１タンク８a、上部第２タンク８ｂに分離されている。上部第２タンク６ｂと上部第１タンク８aとは、連結通路１６で連結されている。
【００２３】
この構成により、風下側熱交換ユニット２は、図３に示すように風下側熱交換ユニット２ａ，２ｂに区分され、風上側熱交換ユニット３は、図４に示すように風上側熱交換ユニット３ａ，３ｂに区分されている。
【００２４】
更に、風下側熱交換ユニット２ｂの上部第２タンク６ｂに、このタンクをタンクの長手方向に分離する分離壁１９が設けられ、仕切壁１０に近いサイドに第１分割タンク６ｂａ、遠いサイド即ち連絡通路１６を設けたサイドに第２分割タンク６ｂｂに分離されている。
同様に、風上側熱交換ユニット３ａの上部第１タンク８ａも、分離壁２０により、第１分割タンク８ａａ、第２分割タンク８ａｂとに分離されている。
【００２５】
上部第２タンク６ｂの第１分割タンク６ｂａ及び上部第２タンク８ａの第１分割タンク８ａａには、それぞれ出口部１７及び１８が設けられ、これらの出口部はお互いに連結され、熱交換器１外に導かれている。
【００２６】
風下側熱交換ユニット２の上部第１タンク部６ａに冷媒の入口部１４が設けられ、風上側熱交換器３の上部第１タンク部８ａの第２分割タンク８ａｂに冷媒の出口部１５が設けられている。
【００２７】
通常の冷媒の流れを説明する。液相冷媒と気相冷媒とからなる冷媒は、通常入口部１４から風下側熱交換ユニット２ａの上部第１タンク６ａに導入され、そこからチューブからなる冷媒通路４を下降し、下部タンク７に導かれる。そして、下部タンク７内を長手方向に流れて、風下側熱交換ユニット２ｂに至り、チューブ４内を上昇して上部第２タンク６ｂに導かれる。
【００２８】
この時に、冷媒中の液相冷媒は、図６に示すように、下部タンク７ａ内の長手方向への流れに従って、チューブ４内のうち、風下側第１熱交換ユニット２ａから遠いほうに集約し、逆に気相冷媒は風下側第１熱交換ユニット２ａに近い方に集約してチューブ内を上昇する。
そのために、上部タンク６ｂの第１分割タンク６ｂａには主に気相冷媒が
集約され、上部タンク６ｂの第２分割タンク６ｂｂには主に液相冷媒が
集約される。
【００２９】
この液相冷媒は、さらに、連結通路１６を通って風上側第２熱交換ユニット３ｂの上部タンク８ｂに導かれ、この熱交換ユニット３ｂのチューブ内を下降し、下部タンク９に至る。その後、冷媒は、この下部タンク９内を長手方向に通流し、風上側熱交換ユニット３ａのチューブ内を上昇し、上部タンク８ａに導かれる。その際に、気相冷媒は主に第１分割タンク８ａａに、液相冷媒は主に第２分割タンク８ａｂに集約される。第２分割タンク８ａｂの冷媒は出口部１５から排出される。
【００３０】
第１分割タンク８ａａの冷媒は、第１分割タンク６ｂａの冷媒と連通されて、熱交換器の外部に排出される。即ち、図５に示すように、第１分割タンク６ｂａの冷媒は風上側熱交換ユニット３ｂ及び３ａをバイパスするので、風上側熱交換ユニットでの冷媒の偏った流れが減少し熱交換効率が向上する。
【００３１】
図７及び図８は第２実施例に関わり、２つの熱交換ユニットが並列に配置されたものである。即ち、第１実施例の風下側熱交換ユニットと風上側熱交換ユニットが並列に配置された構成に相当するものである。
【００３２】
入口部２４から上部タンク２６ａに導入された冷媒は、熱交換ユニット２２ａのチューブ内を下降し、下部タンク２７ａに導かれ、下部タンク２７ａ内を長手方向に流れ、熱交換ユニット２２ｂのチュ−ブ内を上昇する。上昇時、気相冷媒は主に分離壁２９で仕切られた第１分割タンク２６ｂａに集約される。一方、液相の多い冷媒は、第２分割タンク２６ｂｂ内を流れ、上部タンク２６ｃから熱交換ユニット２２ｃのチューブ内を下降し下部タンク２７ｂに至る。更に、この冷媒は下部タンク２７ｂ内を長手方向に流れ、熱交換ユニット２ｄのチューブ内を上昇する。この場合にも、液相冷媒は主に分離壁３０で分離された第２分割タンク２６ｄｂに集約され、出口部２５から排出される。この熱交換ユニット２２ｄ内でも、気相冷媒は主に第１分割タンク２６ｄａに集約される。
【００３３】
この実施例では、気相冷媒の多い冷媒は、分離壁２９および３０により第１分割タンク２６ｂａおよび第１分割タンク２６ｄａに集約され、いっしょにされてこの熱交換器外に排出される。
なお、２１ａ、２１ｂ及び２１ｃは仕切壁であり、熱交換ユニット２２ａ、２２ｂ、２２ｃ及び２２ｄを区別している。
【００３４】
この第２実施例でも、第１実施例と同様に、第１分割タンク２６ｂａに集約された冷媒が熱交換ユニット２２ｃ及び２２ｄをバイパスするので、気相冷媒がこれらの熱交換ユニットのチューブ（冷却通路）を通流することが極減し、熱交換効率が大幅に改善される。
【００３５】
図９は第３実施例を示し、第２実施例に更に熱交換ユニット２２ｅ及び２２ｆを追加したものである。そして、第１分割タンク２６ｄａに集約された冷媒と、第１分割タンク２６ｂａに集約された冷媒とを、熱交換ユニット２２ｆの上部タンク２６ｆ、即ちこの熱交換器の最終タンクに導入する。
【００３６】
この第３実施例では、最終タンクに集約して排出するようにしたので、冷媒の蒸発が多くなり、冷媒の循環量が改善される。それとともに、冷媒の管理が容易であり、ユニットとして取り扱い、組立てなども容易である。
【００３７】
図１０は第４実施例に関わり、第３実施例における気相冷媒の排出通路を上部タンク内に設けたものである。即ち、上部タンク２６ｂの第１分割タンク２６ｂａと上部タンク２６ｄの第１分割タンク２６ｄａを、第２分割タンク２６ｂｂ及び上部タンク２６ｃ内を貫通して連結パイプ４０を設けて連結している。上部タンク２６ｄの第１分割タンク２６ｄａは更に、第２分割タンク２６ｄｂ及び上部タンク２６ｅを貫通する連結パイプ４１により最終の上部タンク２６ｆに連結している。
【００３８】
この第４実施例では、連結パイプ４０及び４１が熱交換ユニット内部に設けられているので、熱交換ユニットの容量を大きくすることがなく、スペース的に有利である。
【００３９】
図１１は第５実施例に関わり、連結パイプ４０及び４１の途中に断面積の大きい拡大部４０ａ（４１ａ）を設け、この拡大部４０ａ（４１ａ）に開口部４２を形成し、ここに溜まった液相冷媒を通常の循環路に返すようにしている。拡大部４０ａ（４１ａ）は、第２分割タンク２６ｂｂ、第２分割タンク２６ｄｂ、上部タンク２６ｃ、上部タンク２６ｅの少なくとも１つに設けるものであって、すべてに設けても良い。
【００４０】
この拡大部により、連結パイプ４０、４１内の液相冷媒が回収され、通常の循環路に戻されるので、熱交換効率が非常に良くなる。
【００４１】
図１２は第６実施例に関わり、連結パイプ４０及び４１の途中に螺旋流通部４３を設け、この螺旋流通部４３に第５実施例と同様に開口部４２を形成し、ここに溜まった液相冷媒を通常の循環路に返すようにしている。螺旋流通部４３は、第２分割タンク２６ｂｂ、第２分割タンク２６ｄｂ、上部タンク２６ｃ、上部タンク２６ｅの少なくとも１つに設けるものであって、すべてに設けても良い。
【００４２】
この螺旋流通部４３により、連結パイプ４０、４１内の液相冷媒が回収され、通常の循環路に戻されるので、熱交換効率が非常に良くなる。
この螺旋流通部４３と拡大部４０ａ（４１ａ）とを組み合わせて設けても良い。
【００４３】
図１３は第７実施例に関わり、第２実施例の図８に相当する図である。この第７実施例が第２実施例と異なる点は、排出通路４４が上部タンクの外周壁に接して形成されており、その外周壁に開口部４５を形成している。
この実施例では、排出通路４４の形成が容易であり、部品点数も少なくて済む。
【００４４】
上記に述べた実施例では、冷媒通路を半割の扁平チューブを合わせた形状により形成しているが、この形状に限られるものではなく、押出し成形扁平チューブ等でも良い。
【００４５】
【発明の効果】
請求項１の発明では、
第２熱交換ユニットの上部タンク部を仕切部材に近いサイドと遠いサイドとに２つに分離する分離壁が設けられ、上記仕切部材から遠いサイドの第１分割タンク部に第１出口部が設けられ、上記仕切部材に近いサイドの第２分割タンク部に第２出口部が設けられ、第１熱交換ユニットの上部タンク部に冷媒を供給する入口部が設けられ、第１熱交換ユニットの上部タンク部に導入された冷媒が、第１熱交換ユニットのチューブ内を下降して下部タンク部に導かれ、そこから第２熱交換ユニットの下部タンク部に導かれ、さらに第２熱交換ユニットのチューブ内を上昇して、上記両第１及び第２分割タンク部に導かれ、それぞれの第１及び第２出口部から排出されるように構成されているので、気相冷媒の多い冷媒を、第２熱交換ユニットの上部タンク部で分離でき、比較的液相の多い冷媒を通常に循環でき、熱交換機能を向上できる。
【００４６】
並置された第１及び第２熱交換ユニットからなるセットが２セット以上設けられ、第１セットの第１分割タンク部の第１出口部が、第２セットの第１熱交換ユニットとの上部タンク部に接続され、第１セットの第１分割タンク部の冷媒が第２セットの熱交換ユニットに導かれ、第１セットの第２分割タンク部の第２出口部が、第２セットの熱交換ユニットをバイパスして設けられている構成では、第２セットの熱交換ユニットへの気相冷媒の導入が極減できるので、第２セットの熱交換ユニットでの冷媒の流速が相対的に遅くなり、分流の偏りも減少できる。
【００４７】
第１セットの第２分割タンク部の第２出口部と、第２セットの第２分割タンク部の第２出口部とが連通されて、途中から分離した管路を最終熱交換ユニットの最終タンクに接続するものでは、蒸発が不十分な冷媒であってもこの最終タンク部で蒸発が促進され、液相冷媒の流出を防止できる。
【図面の簡単な説明】
【図１】本発明を適用した第１実施例の熱交換器の概略斜視図を示す。
【図２】第１実施例の冷媒のフローを示す説明図である。
【図３】第１実施例の風下側熱交換ユニットの説明図である。
【図４】第１実施例の風上側熱交換ユニットの説明図である。
【図５】第１実施例の冷媒のフローを示すブロック図である。
【図６】第１実施例に関わり、気体冷媒の通流状態を説明する図である。
【図７】第２実施例に関わり、図２と同様な図を示す。
【図８】第２実施例に関わり、気体冷媒の通流状態を説明する図である。
【図９】第３実施例に関わり、図２と同様な図を示す。
【図１０】第４実施例に関わり、図２と同様な図を示す。
【図１１】第５実施例に関わり、熱交換ユニットの一部を示す図である。
【図１２】第６実施例に関わり、熱交換ユニットの一部を示す図である。
【図１３】第７実施例に関わり、図２と同様な図を示す。
【図１４】従来技術を示す図である。
【図１５】従来技術の液相冷媒及び気相冷媒の分布状態説明する図である。
【符号の説明】
１熱交換器
２風下側熱交換ユニット
３風上側熱交換ユニット
４チューブ（冷媒通路）
５フィン
６ａ上部第１タンク
６ｂ上部第２タンク
７下部タンク
８ａ上部第１タンク
８ｂ上部第２タンク
９下部タンク
１０仕切部材
１１仕切部材
１４入口部
１５出口部
１６連通路
１７出口部
１８出口部
２１ａ、２１ｂ、２１ｃ仕切部材
２２ａ、２２ｂ、２２ｃ、２２ｄ、２２ｅ、２２ｆ熱交換ユニット
２４入口部
２５出口部
２６ａ、２６ｂ、２６ｃ、２６ｄ、２６ｅ、２６ｆ上部タンク
２６ｂａ第１分割タンク
２６ｂｂ第２分割タンク
２６ｄａ第１分割タンク
２６ｄｂ第２分割タンク
２７ａ、２７ｂ下部タンク
２９仕切部材
３０仕切部材
４０、４１連結パイプ
４２開口部
４３螺旋通路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger configured by connecting at least two heat exchange units each having a refrigerant passage for performing refrigerant evaporation.
[0002]
[Prior art]
Conventionally, a heat exchanger such as that disclosed in Japanese Patent Application Laid-Open No. 09-170850 is known. In this heat exchanger, as shown in FIG. 14, the heat exchange unit has a tank portion disposed at both upper and lower end portions, and is stacked on the leeward side and the windward side.
[0003]
In this heat exchanger, a partition portion 111 is provided in the central portion of the lower tank portion of the leeward heat exchanger 102, and is divided into a first lower tank 107a and a second lower tank 107b. Similarly, a partition 110 is provided at the center of the upper tank portion of the windward heat exchanger, and is divided into a first upper tank 108a and a second upper tank 108b. The second lower tank 107b and the second upper tank 108b communicate with each other through the communication path 112. The first lower tank 107a is provided with a refrigerant inlet 114, and the first upper tank 108a is provided with an outlet 115.
[0004]
In this heat exchanger, the refrigerant enters the first lower tank 107 a from the inlet 114, rises through the refrigerant passage in the tube, and is guided to the upper tank 106. Then, the inside of the upper tank 106 flows in the longitudinal direction, descends the refrigerant passage, and reaches the second lower tank 107b. Further, the refrigerant is guided to the second upper tank 108b through the communication path 112, and then descends the refrigerant path and is guided to the lower tank 109. The refrigerant flows through the lower tank 109 in the longitudinal direction and rises in the refrigerant path. Then, it reaches the first upper tank 108a and flows out from the outlet 115 of the first upper tank 108a.
[0005]
[Problems to be solved by the invention]
In Japanese Patent Application Laid-Open No. 09-170850, a liquid-phase refrigerant and a gas-phase refrigerant of a gas-liquid two-phase refrigerant enter the first lower tank 107a from the inlet portion 114, and ascend the leeward refrigerant passage in the tube and move to the upper tank 106. Led to. At that time, as shown in FIG. 15, the light gas-phase refrigerant tends to accumulate in the central upper portion of the refrigerant passage. The normal refrigerant flows through the upper tank 106 in the longitudinal direction and descends the refrigerant passage to reach the second lower tank 107b. However, when flowing through the upper tank 106 in the longitudinal direction, a relatively heavy liquid phase refrigerant is used. Is led to the back in the longitudinal direction by the flow inertia, and as a result, the gas-phase refrigerant tends to accumulate in the central lower portion of the refrigerant passage. The same thing happens with the windward heat exchange unit.
[0006]
As described above, since the gas-phase refrigerant concentrates and stagnates in a part of the heat exchange unit, a uniform flow cannot be obtained, an uniform heat distribution cannot be obtained, and the heat exchange in the heat exchange unit is sufficiently performed. Absent. Therefore, it is conceivable to increase the number of heat exchange units and increase the path length of the refrigerant passage. By doing so, the total capacity of the heat exchange unit is increased, resulting in a space problem. In addition, it is conceivable to subdivide the heat exchange unit and increase the number of heat exchange units, so-called multipath, but the path length of the refrigerant passage becomes longer, the flow resistance increases, and the pressure loss increases.
[0007]
In particular, in a type in which a liquid phase refrigerant and a gas phase refrigerant coexist and flow downward in the heat exchange unit and then rise U-turn from there, the liquid phase refrigerant and the gas phase refrigerant are increased in the rising refrigerant passage. The distribution of temperature increases, the difference in temperature distribution increases, and the heat exchange capacity decreases. At the same time, the biased liquid-phase refrigerant has poor evaporation efficiency and is directly discharged from the outlet of the heat effect unit, so that the amount of refrigerant circulation is reduced and the cooling capacity is lowered.
[0008]
The present invention aims to solve the above-mentioned problems of the prior art, and in particular, heat that can sufficiently exert a heat exchange effect even when a liquid-phase refrigerant and a gas-phase refrigerant of a two-phase refrigerant are introduced into a heat exchange unit. An exchange is provided. In particular, in consideration of the flow situation of the gas-phase refrigerant and the liquid-phase refrigerant in the heat exchange unit, the flow of the gas-phase refrigerant in the heat exchange unit is reduced as much as possible, and the gas-phase refrigerant becomes a refrigerant passage of the heat exchange unit. This reduces stagnation or occurrence.
[0009]
[Means for Solving the Problems]
The invention of claim 1
A pair of upper and lower tank parts, a plurality of tubes connected between the tank parts, and two heat exchange units configured by arranging fins between the tubes are provided, and the tank parts of the respective heat exchange units are communicated with each other. In the heat exchanger configured as
The upper tank part of the first heat exchange unit and the upper tank part of the second heat exchange unit are partitioned by a partition member, and the lower tank part of the first heat exchange unit and the lower tank part of the second heat exchange unit are communicated with each other. ,
A separation wall that separates the upper tank portion of the second heat exchange unit into two parts, a side closer to the partition member and a side far from the partition member, is provided, and a first outlet portion is provided in the first division tank portion on the side far from the partition member A second outlet portion is provided in the second divided tank portion on the side close to the partition member,
An inlet for supplying refrigerant to the upper tank of the first heat exchange unit is provided;
The refrigerant introduced into the upper tank part of the first heat exchange unit descends in the tube of the first heat exchange unit and is led to the lower tank part, and from there, is led to the lower tank part of the second heat exchange unit, Furthermore, it raises the inside of the tube of a 2nd heat exchange unit, it is guide | induced to both said 1st and 2nd division | segmentation tank parts, and it is comprised from each 1st and 2nd exit part.
[0010]
In this configuration, since the refrigerant with a large amount of gas phase refrigerant can be separated in the upper tank portion of the second heat exchange unit, the generation of gas phase refrigerant in the heat exchange unit can be reduced, and the bias of the liquid phase refrigerant can be reduced, The heat exchange function can be improved.
[0011]
The invention of claim 2 is the heat exchanger of claim 1,
The first heat exchange unit and the second heat exchange unit are juxtaposed, and two or more sets of the first and second heat exchange units are provided, and the first outlet portion of the first divided tank portion of the first set Is connected to the upper tank part with the second set of first heat exchange units, the refrigerant of the first set of first divided tank parts is led to the second set of heat exchange units, and the first set of second divided parts The second outlet portion of the tank portion is provided to bypass the second set of heat exchange units.
[0012]
In this configuration, since the introduction of the gas-phase refrigerant to the second set of heat exchange units can be extremely reduced, the flow rate of the refrigerant in the second set of heat exchange units becomes relatively slow, and the deviation of the diversion is also reduced.
[0013]
According to a third aspect of the present invention, in the heat exchanger according to the second aspect, the second outlet portion of the second divided tank portion of the first set communicates with the second outlet portion of the second divided tank portion of the second set. And it is the structure connected to the exterior of the heat exchange unit of a 1st set and a 2nd set, and a pipe line can be arrange | positioned comparatively compactly.
[0014]
According to a fourth aspect of the present invention, in the heat exchanger according to the second aspect, the second outlet portion of the second divided tank portion of the first set communicates with the second outlet portion of the second divided tank portion of the second set. Since it is connected to the final tank of the final heat exchange unit of the heat exchanger, even if the refrigerant is insufficiently evaporated, evaporation is promoted in the final tank portion, and the outflow of the liquid phase refrigerant can be prevented.
[0015]
According to a fifth aspect of the present invention, in the heat exchanger according to the second aspect, the second outlet portion of the second divided tank portion of the first set and the second outlet portion of the second divided tank portion of the second set are mutually connected. Since it is connected by a connecting pipe provided in the upper tank, a pipe line can be provided without increasing the total capacity of the heat exchange unit, and space efficiency is improved.
[0016]
According to a sixth aspect of the present invention, in the heat exchanger according to the fifth aspect, in the portion where the connecting pipe penetrates the first divided tank portion of the first set, an enlarged portion having a cross-sectional area larger than the cross-sectional area in the pipe is provided. And the enlarged portion is provided with an opening that opens to the first divided tank portion, so that the separation of the liquid-phase refrigerant and the gas-phase refrigerant in the connecting pipe is promoted, and the liquid-phase refrigerant is transferred to the first divided tank. The heat exchange capacity is improved.
[0017]
The invention according to claim 7 is the heat exchanger according to claim 5 or 6, wherein the refrigerant passing through the connection pipe pipe is spirally formed in a portion where the connection pipe penetrates the first divided tank portion of the first set. It has a configuration in which a spiral circulation part is provided to facilitate separation of the liquid-phase refrigerant and the gas-phase refrigerant in the connection pipe, and the liquid-phase refrigerant casting is positively returned to the heat exchange unit. The flow bias is reduced, the flow distribution is improved, and the heat exchange capacity is improved.
[0018]
The invention according to claim 8 is the heat exchanger according to claim 2, wherein the second outlet portion of the second divided tank portion of the first set and the second outlet portion of the second divided tank portion of the second set are mutually connected. Are connected by a connecting pipe provided in contact with the outer wall of the upper tank of the tank, so that the separation of the liquid-phase refrigerant and the gas-phase refrigerant in the connecting pipe is promoted, and the liquid-phase refrigerant is The heat exchange capacity is improved.
[0019]
The ninth aspect of the present invention is the heat exchanger according to the eighth aspect, wherein the connecting pipe has a cross-sectional area that is larger than the cross-sectional area in the pipe in a portion that is back-to-back with the first divided tank portion of the first set. And an opening that opens to the first divided tank portion is provided in the enlarged portion, so that separation of the liquid-phase refrigerant and the gas-phase refrigerant in the connecting pipe is promoted, and the liquid-phase refrigerant is used as the first divided tank. The heat exchange capacity is improved.
[0020]
According to a tenth aspect of the present invention, in the heat exchanger according to the eighth or ninth aspect, the refrigerant passing through the connection pipe pipe is spirally formed in a portion where the connection pipe is back-to-back with the first divided tank portion of the first set. And the separation of the liquid-phase refrigerant and the gas-phase refrigerant in the connecting pipe is promoted, and the liquid-phase refrigerant casting is positively returned to the heat exchange unit. The flow bias is reduced, the flow distribution is improved, and the heat exchange capacity is improved.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show a heat exchanger 1 of the first embodiment. As shown in FIG. 1, the heat exchanger 1 includes a leeward heat exchange unit 2 and an leeward heat exchange unit 3 as indicated by a wind direction A. Each of the leeward side heat exchange unit 2 and the leeward side heat exchange unit 3 has a plurality of tubes 4 and undulating fins 5 alternately stacked, and tanks provided above and below the stacked tubes 4 and undulating fins 5. It consists of parts 6, 7 and 8, 9.
[0022]
In this first embodiment, as shown in FIG. 2, partition members 10 and 11 are provided in the upper tank 6 of the leeward heat exchange unit 2 and the upper tank 8 of the leeward heat exchange unit 3, respectively. 6 is separated into an upper first tank 6a and an upper second tank 6b, and an upper tank 8 is separated into an upper first tank 8a and an upper second tank 8b. The upper second tank 6b and the upper first tank 8a are connected by a connecting passage 16.
[0023]
With this configuration, the leeward heat exchange unit 2 is divided into leeward heat exchange units 2a and 2b as shown in FIG. 3, and the leeward heat exchange unit 3 is separated into the leeward heat exchange unit 3a as shown in FIG. , 3b.
[0024]
Further, a separation wall 19 for separating the tank in the longitudinal direction of the tank is provided in the upper second tank 6b of the leeward side heat exchange unit 2b, and the first divided tank 6ba is connected to the side closer to the partition wall 10 and is connected to the far side. The second split tank 6bb is separated on the side where the passage 16 is provided.
Similarly, the upper first tank 8a of the windward heat exchange unit 3a is also separated by the separation wall 20 into the first divided tank 8aa and the second divided tank 8ab.
[0025]
The first divided tank 6ba of the upper second tank 6b and the first divided tank 8aa of the upper second tank 8a are provided with outlet portions 17 and 18, respectively, and these outlet portions are connected to each other, and the heat exchanger 1 Led outside.
[0026]
A refrigerant inlet 14 is provided in the upper first tank 6a of the leeward heat exchange unit 2, and a refrigerant outlet 15 is provided in the second divided tank 8ab of the upper first tank 8a of the windward heat exchanger 3. It has been.
[0027]
A normal refrigerant flow will be described. A refrigerant composed of a liquid-phase refrigerant and a gas-phase refrigerant is usually introduced from the inlet 14 into the upper first tank 6a of the leeward heat exchange unit 2a, and descends from the refrigerant passage 4 made of a tube to the lower tank 7. Led. Then, it flows in the lower tank 7 in the longitudinal direction, reaches the leeward heat exchange unit 2b, rises in the tube 4, and is guided to the upper second tank 6b.
[0028]
At this time, as shown in FIG. 6, the liquid-phase refrigerant in the refrigerant is concentrated in the tube 4 farther from the leeward first heat exchange unit 2a in accordance with the flow in the longitudinal direction in the lower tank 7a. On the contrary, the gas-phase refrigerant is concentrated in the direction closer to the leeward side first heat exchange unit 2a and rises in the tube.
For this purpose, the gas phase refrigerant is mainly concentrated in the first divided tank 6ba of the upper tank 6b, and the liquid phase refrigerant is mainly concentrated in the second divided tank 6bb of the upper tank 6b.
[0029]
The liquid-phase refrigerant is further guided to the upper tank 8b of the windward second heat exchange unit 3b through the connection passage 16, and descends in the tube of the heat exchange unit 3b to reach the lower tank 9. Thereafter, the refrigerant flows through the lower tank 9 in the longitudinal direction, rises in the tube of the windward heat exchange unit 3a, and is guided to the upper tank 8a. At that time, the gas-phase refrigerant is mainly collected in the first divided tank 8aa, and the liquid-phase refrigerant is mainly collected in the second divided tank 8ab. The refrigerant in the second divided tank 8ab is discharged from the outlet portion 15.
[0030]
The refrigerant in the first divided tank 8aa communicates with the refrigerant in the first divided tank 6ba and is discharged to the outside of the heat exchanger. That is, as shown in FIG. 5, the refrigerant in the first split tank 6ba bypasses the windward heat exchange units 3b and 3a, so that the uneven flow of refrigerant in the windward heat exchange unit is reduced and the heat exchange efficiency is improved. To do.
[0031]
7 and 8 relate to the second embodiment, in which two heat exchange units are arranged in parallel. That is, it corresponds to a configuration in which the leeward heat exchange unit and the leeward heat exchange unit of the first embodiment are arranged in parallel.
[0032]
The refrigerant introduced into the upper tank 26a from the inlet portion 24 descends in the tube of the heat exchange unit 22a, is guided to the lower tank 27a, flows in the longitudinal direction in the lower tank 27a, and moves to the tube of the heat exchange unit 22b. Rise inside. When rising, the gas-phase refrigerant is concentrated mainly in the first divided tank 26ba partitioned by the separation wall 29. On the other hand, the refrigerant with a large liquid phase flows in the second divided tank 26bb, descends from the upper tank 26c in the tube of the heat exchange unit 22c, and reaches the lower tank 27b. Further, this refrigerant flows in the longitudinal direction in the lower tank 27b and rises in the tube of the heat exchange unit 2d. Also in this case, the liquid-phase refrigerant is mainly collected in the second divided tank 26db separated by the separation wall 30, and is discharged from the outlet portion 25. Even in the heat exchange unit 22d, the gas-phase refrigerant is mainly concentrated in the first divided tank 26da.
[0033]
In this embodiment, the refrigerant with a large amount of gas phase refrigerant is collected by the separation walls 29 and 30 into the first divided tank 26ba and the first divided tank 26da, and is discharged together outside the heat exchanger.
In addition, 21a, 21b, and 21c are partition walls, and distinguish the heat exchange units 22a, 22b, 22c, and 22d.
[0034]
In the second embodiment, as in the first embodiment, the refrigerant concentrated in the first division tank 26ba bypasses the heat exchange units 22c and 22d. The flow through the passage) is greatly reduced, and the heat exchange efficiency is greatly improved.
[0035]
FIG. 9 shows a third embodiment in which heat exchange units 22e and 22f are further added to the second embodiment. The refrigerant concentrated in the first divided tank 26da and the refrigerant concentrated in the first divided tank 26ba are introduced into the upper tank 26f of the heat exchange unit 22f, that is, the final tank of this heat exchanger.
[0036]
In the third embodiment, since the exhaust gas is concentrated in the final tank, the evaporation of the refrigerant increases, and the circulation amount of the refrigerant is improved. At the same time, the management of the refrigerant is easy, and it is easy to handle and assemble as a unit.
[0037]
FIG. 10 relates to the fourth embodiment, in which a gas-phase refrigerant discharge passage in the third embodiment is provided in the upper tank. That is, the first divided tank 26ba of the upper tank 26b and the first divided tank 26da of the upper tank 26d are connected through the second divided tank 26bb and the upper tank 26c by providing the connecting pipe 40. The first divided tank 26da of the upper tank 26d is further connected to the final upper tank 26f by a connecting pipe 41 that passes through the second divided tank 26db and the upper tank 26e.
[0038]
In the fourth embodiment, since the connecting pipes 40 and 41 are provided inside the heat exchange unit, the capacity of the heat exchange unit is not increased, which is advantageous in terms of space.
[0039]
FIG. 11 relates to the fifth embodiment, and an enlarged portion 40a (41a) having a large cross-sectional area is provided in the middle of the connecting pipes 40 and 41, and an opening 42 is formed in the enlarged portion 40a (41a) and accumulated therein. The liquid phase refrigerant is returned to the normal circulation path. The enlarged portion 40a (41a) is provided in at least one of the second divided tank 26bb, the second divided tank 26db, the upper tank 26c, and the upper tank 26e, and may be provided in all of them.
[0040]
By this enlarged portion, the liquid-phase refrigerant in the connection pipes 40 and 41 is recovered and returned to the normal circulation path, so that the heat exchange efficiency becomes very good.
[0041]
FIG. 12 relates to the sixth embodiment. A spiral flow portion 43 is provided in the middle of the connecting pipes 40 and 41, and an opening 42 is formed in the spiral flow portion 43 as in the fifth embodiment. The phase refrigerant is returned to the normal circulation path. The spiral flow part 43 is provided in at least one of the second divided tank 26bb, the second divided tank 26db, the upper tank 26c, and the upper tank 26e, and may be provided in all of them.
[0042]
The spiral circulation part 43 collects the liquid-phase refrigerant in the connection pipes 40 and 41 and returns it to the normal circulation path, so that the heat exchange efficiency becomes very good.
You may provide combining this spiral distribution part 43 and the expansion part 40a (41a).
[0043]
FIG. 13 relates to the seventh embodiment and corresponds to FIG. 8 of the second embodiment. The seventh embodiment differs from the second embodiment in that the discharge passage 44 is formed in contact with the outer peripheral wall of the upper tank, and an opening 45 is formed in the outer peripheral wall.
In this embodiment, the discharge passage 44 can be easily formed and the number of parts can be reduced.
[0044]
In the embodiment described above, the refrigerant passage is formed in a shape in which half flat tubes are combined, but the shape is not limited to this shape, and an extruded flat tube or the like may be used.
[0045]
【The invention's effect】
In the invention of claim 1,
A separation wall that separates the upper tank portion of the second heat exchange unit into two parts, a side closer to the partition member and a side far from the partition member, is provided, and a first outlet portion is provided in the first division tank portion on the side far from the partition member A second outlet portion is provided in the second divided tank portion on the side close to the partition member, an inlet portion for supplying a refrigerant to the upper tank portion of the first heat exchange unit is provided, and an upper portion of the first heat exchange unit is provided. The refrigerant introduced into the tank part descends in the tube of the first heat exchange unit and is led to the lower tank part, from there to the lower tank part of the second heat exchange unit, and further to the second heat exchange unit. Since it is configured to rise in the tube and be guided to both the first and second divided tank parts and discharged from the respective first and second outlet parts, Above the second heat exchange unit Be separated by a tank, a relatively liquid phase of more refrigerant can circulate normally, it is possible to improve the heat exchange function.
[0046]
Two or more sets of the first and second heat exchange units juxtaposed are provided, and the first outlet of the first divided tank section of the first set is an upper tank with the first heat exchange unit of the second set. The refrigerant in the first set of the first divided tank section is guided to the second set of heat exchange units, and the second outlet section of the first set of the second divided tank section is in the second set of heat exchange. In the configuration provided by bypassing the unit, the introduction of the gas-phase refrigerant to the second set of heat exchange units can be extremely reduced, so the flow rate of the refrigerant in the second set of heat exchange units becomes relatively slow. Also, the bias of the diversion can be reduced.
[0047]
The second outlet of the first divided second tank part and the second outlet of the second divided second tank part communicate with each other, and the pipe separated from the middle is connected to the final tank of the final heat exchange unit. In the case where the refrigerant is connected to the refrigerant, the evaporation is promoted in the final tank portion even if the refrigerant is insufficiently evaporated, and the outflow of the liquid-phase refrigerant can be prevented.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a heat exchanger according to a first embodiment to which the present invention is applied.
FIG. 2 is an explanatory diagram showing a refrigerant flow of the first embodiment.
FIG. 3 is an explanatory diagram of the leeward heat exchange unit of the first embodiment.
FIG. 4 is an explanatory diagram of the windward heat exchange unit of the first embodiment.
FIG. 5 is a block diagram showing a refrigerant flow of the first embodiment.
FIG. 6 is a diagram for explaining the flow state of the gaseous refrigerant in connection with the first embodiment.
FIG. 7 relates to the second embodiment and shows a diagram similar to FIG.
FIG. 8 is a diagram for explaining a flow state of a gaseous refrigerant in connection with the second embodiment.
FIG. 9 relates to the third embodiment and shows a diagram similar to FIG.
FIG. 10 relates to the fourth embodiment and shows a diagram similar to FIG.
FIG. 11 is a diagram showing a part of a heat exchange unit related to the fifth embodiment.
FIG. 12 is a diagram showing a part of a heat exchange unit related to the sixth embodiment.
FIG. 13 relates to the seventh embodiment and shows a diagram similar to FIG.
FIG. 14 is a diagram showing a conventional technique.
FIG. 15 is a diagram illustrating a distribution state of a liquid-phase refrigerant and a gas-phase refrigerant according to a conventional technique.
[Explanation of symbols]
1 Heat Exchanger 2 Downward Heat Exchange Unit 3 Upward Heat Exchange Unit 4 Tube (refrigerant passage)
5 Fin 6a Upper first tank 6b Upper second tank 7 Lower tank 8a Upper first tank 8b Upper second tank 9 Lower tank 10 Partition member 11 Partition member 14 Entrance portion 15 Exit portion 16 Communication passage 17 Exit portion 18 Exit portion 21a , 21b, 21c Partition members 22a, 22b, 22c, 22d, 22e, 22f Heat exchange unit 24 Inlet part 25 Outlet parts 26a, 26b, 26c, 26d, 26e, 26f Upper tank 26ba First divided tank 26bb Second divided tank 26da 1st division tank 26db 2nd division tank 27a, 27b Lower tank 29 Partition member 30 Partition member 40, 41 Connection pipe 42 Opening 43 Spiral passage

Claims

A pair of upper and lower tank parts, a plurality of tubes connected between these tank parts, and two heat exchange units configured by arranging fins between the tubes are provided, and the tank parts of each heat exchange unit are communicated In the heat exchanger configured as
The upper tank part of the first heat exchange unit and the upper tank part of the second heat exchange unit are partitioned by a partition member, and the lower tank part of the first heat exchange unit and the lower tank part of the second heat exchange unit are communicated with each other. ,
A separation wall that separates the upper tank portion of the second heat exchange unit into a side closer to the partition member and a far side is provided, and a first outlet portion is provided in the first divided tank portion on the side far from the partition member, A second outlet portion is provided in the second divided tank portion on the side close to the partition member,
An inlet for supplying refrigerant to the upper tank of the first heat exchange unit is provided;
The refrigerant introduced into the upper tank part of the first heat exchange unit descends in the tube of the first heat exchange unit and is led to the lower tank part, and from there, is led to the lower tank part of the second heat exchange unit, Furthermore, the inside of the tube of the second heat exchange unit is raised, guided to both the first and second divided tank parts, and discharged from the first outlet part and the second outlet part. Heat exchanger.

The heat exchanger according to claim 1, wherein the first heat exchange unit and the second heat exchange unit are juxtaposed, and two or more sets of the first and second heat exchange units are provided. The first outlet of the one-part tank part is connected to the upper tank part of the first heat exchange unit of the second set, and the refrigerant in the first part tank part of the first set is led to the heat exchange unit of the second set; The second outlet portion of the first set of second divided tank portions is provided to bypass the second set of heat exchange units.

The heat exchanger according to claim 2, wherein the second outlet portion of the first set of second divided tank portions and the second outlet portion of the second set of second divided tank portions are communicated, and the first set and It is connected to the outside of the second set of heat exchange units.

3. The heat exchanger according to claim 2, wherein the second outlet portion of the second divided tank portion of the first set communicates with the second outlet portion of the second divided tank portion of the second set, and It is connected to the final tank of the final heat exchange unit.

3. The heat exchanger according to claim 2, wherein the second outlet portion of the first set of second divided tank portions and the second outlet portion of the second set of second divided tank portions are provided in the upper tanks of each other. It is connected by a connecting pipe.

6. The heat exchanger according to claim 5, wherein an enlarged portion having a cross-sectional area larger than the cross-sectional area in the pipe is provided in a portion where the connecting pipe penetrates through the first divided tank portion of the first set, and the enlarged portion is provided with the enlarged portion. The opening part which opens to a 1st division | segmentation tank part was provided, It is characterized by the above-mentioned.

The heat exchanger according to claim 5 or 6, wherein a spiral flow part through which the refrigerant passing through the connection pipe pipe flows spirally in a part where the connection pipe passes through the first divided tank part of the first set. It is provided.

3. The heat exchanger according to claim 2, wherein the second outlet portion of the first set of the second divided tank portion and the second outlet portion of the second set of the second divided tank portion are in contact with the outer walls of the upper tanks of each other. It is connected to the connecting pipe provided.

9. The heat exchanger according to claim 8, wherein an enlarged portion having a cross-sectional area larger than a cross-sectional area in the pipe is provided in a portion where the connection pipe is back-to-back with the first divided tank portion of the first set, and the enlarged portion is provided in the enlarged portion. An opening that opens to the first divided tank is provided.

The heat exchanger according to claim 8 or 9, wherein the refrigerant passing through the connection pipe pipe spirally flows in a portion where the connection pipe is back-to-back with the first divided tank portion of the first set. Is provided.