JP3826791B2 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
JP3826791B2
JP3826791B2 JP2002000637A JP2002000637A JP3826791B2 JP 3826791 B2 JP3826791 B2 JP 3826791B2 JP 2002000637 A JP2002000637 A JP 2002000637A JP 2002000637 A JP2002000637 A JP 2002000637A JP 3826791 B2 JP3826791 B2 JP 3826791B2
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Japan
Prior art keywords
fluid passage
heat exchanger
flat tube
porous flat
fluid
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JP2002000637A
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Japanese (ja)
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JP2003202197A (en
Inventor
典秀 河地
憲 山本
昌章 川久保
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Denso Corp
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Denso Corp
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Priority to DE2003100054 priority patent/DE10300054A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0243—Header boxes having a circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0008—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one medium being in heat conductive contact with the conduits for the other medium
    • F28D7/0025—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one medium being in heat conductive contact with the conduits for the other medium the conduits for one medium or the conduits for both media being flat tubes or arrays of tubes
    • F28D7/0033—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one medium being in heat conductive contact with the conduits for the other medium the conduits for one medium or the conduits for both media being flat tubes or arrays of tubes the conduits for one medium or the conduits for both media being bent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F7/00—Elements not covered by group F28F1/00, F28F3/00 or F28F5/00
    • F28F7/02—Blocks traversed by passages for heat-exchange media

Description

【０００１】
【発明の属する技術分野】
本発明は、押出成形で形成される多数の流体通路孔が断面厚み方向に複数の列状に配置された多孔扁平チューブを熱交換部に用いた熱交換器に関するもので、その複数列の流体通路孔に例えば第１流体と第２流体とを流通させて熱交換を行わせるのに好適なものである。
【０００２】
【従来の技術】
従来技術として、押出成形で形成される多数の流体通路孔が断面厚み方向に複数の列状に配置された多孔扁平チューブを熱交換部に用い、その複数列の流体通路孔の列毎に、例えば第１流体として高温高圧の冷媒と第２流体として低温低圧の冷媒とを流通させて熱交換を行わせる熱交換器が知られている。例えば、本出願人が先に出願した特開２０００−３４６５８４号公報に示す熱交換器の構造がある。
【０００３】
【発明が解決しようとする課題】
しかし、上記公報に示す従来構造では、多孔扁平チューブ１００の端部を図４（ａ）に示すような形状にフライスカッター等で削る必要があり、薄物の広い面を精度良く削ることから加工コストが高くつくうえ、回転する刃具方向に流体通路孔１００ａが開口するため削った切り粉が入り込んで詰まるという問題点がある。（尚、図中の符号は後述する実施形態と対応するものである。）
また、この削った多孔扁平チューブ１００を、二重管の外側ヘッダタンク（パイプ）に挿通させるための長孔は長円形となりプレス加工が容易な形状であるが、二重管の内側ヘッダタンク（パイプ）に挿通させるための長孔は両側に鋭い角を持った略Ｄ字型の形状となるためプレス加工が難しいうえ、このことより、多孔扁平チューブ１００のＤ字型外形部と内側ヘッダタンク（パイプ）との接合（ろう付け）部の気密が不完全となっても、内部リークとなるため検出が難しいという問題点もある。
【０００４】
本発明は、上記従来技術の問題点に鑑みて成されたものであり、その目的は、多孔扁平チューブ内の流体通路孔とヘッダタンクとの連通構造を簡単としてコストを抑えられるうえ気密信頼性も向上できる熱交換器を提供することにある。
【０００５】
【課題を解決するための手段】
上記目的を達成するため、本発明では以下の技術的手段を採用する。請求項１記載の発明では、押出成形で形成される多数の流体通路孔（１００ａ）が断面厚み方向に複数の列状に配置された多孔扁平チューブ（１００）を熱交換部に用いた熱交換器において、多孔扁平チューブ（１００）の扁平面であって、前記流体通路孔（１００ａ）の一方の列の側面に、幅方向に渡って前記流体通路孔（１００ａ）の前記一方の列にのみ達して開口部となる所定深さの矩形形状、Ｖ字形状またはＵ字形状の切り込み（１１０ａ、１２０ａ）を入れ、この切り込み（１１０ａ、１２０ａ）の回りにヘッダタンク（２１０、２２０、２１１、２２１）を接合し、前記切り込み（１１０ａ、１２０ａ）を介して前記流体通路孔（１００ａ）の前記一方の列と前記ヘッダタンク（２１０、２２０、２１１、２２１）とを連通させていることを特徴とする。
【０００６】
これにより、多孔扁平チューブ（１００）内の流体通路孔（１００ａ）と各ヘッダタンク（２１０、２２０、２１１、２２１）との連通構造が簡単となってコストを抑えられるうえ気密信頼性も向上させることができる。
請求項２記載の発明では、多孔扁平チューブ（１００）の扁平面に幅方向に渡って所定深さの切り込み（１１０ａ、１２０ａ）を当該切り込み（１１０ａ、１２０ａ）の両側に扁平面が残るように入れ、この切り込み（１１０ａ、１２０ａ）の回りにヘッダタンク（２１０、２２０、２１１、２２１）を接合し、切り込み（１１０ａ、１２０ａ）を介して流体通路孔（１００ａ）とヘッダタンク（２１０、２２０、２１１、２２１）とを連通させていることを特徴とする。これにより、多孔扁平チューブ（１００）内の流体通路孔（１００ａ）と各ヘッダタンク（２１０、２２０、２１１、２２１）との連通構造が簡単となってコストを抑えられるうえ気密信頼性も向上させることができる。
【０００７】
請求項３記載の発明では、板状の金属加工品（２１１、２２１）を多孔扁平チューブ（１００）の扁平面に接合して切り込み（１１０ａ、１２０ａ）を被うことで金属加工品（２１１、２２１）をヘッダタンク（２１１、２２１）としたことを特徴とする。これにより、ヘッダタンク（２１１、２２１）を必要部分の多孔扁平チューブ（１００）の片面にだけに突出させたコンパクトな熱交換器とすることができる。
【０００８】
請求項４記載の発明では、多孔扁平チューブ（１００）を幅方向に渡って厚み方向に潰した潰し部（１００ｂ）を設けることにより、流体通路孔（１００ａ）の流通を封止したことを特徴とする。これにより、簡単な加工で流体通路孔（１００ａ）の流通を封止できるので、熱交換器のコストを抑えることができる。
【０００９】
請求項５記載の発明では、切り込み（１１０ａ、１２０ａ）に封止部品（１４０）を接合することにより、流体通路孔（１００ａ）の流通を封止したことを特徴とする。これにより、切り込み（１１０ａ、１２０ａ）と封止部品（１４０）とを組み合わせることで簡単に流体通路孔（１００ａ）の流通を封止でき、熱交換器の気密信頼性を向上することができる。
【００１０】
請求項６記載の発明では、多孔扁平チューブ（１００）は、第１面側に配置され第１流体が流通する流体通路孔（１００ａ）の一部で構成された第１流体通路（１１０）と、第１面と反対側の第２面側に配置され第２流体が流通する流体通路孔（１００ａ）の他部で構成された第２流体通路（１２０）とを有し、少なくとも多孔扁平チューブ（１００）の第１面に幅方向に渡って所定深さの矩形形状、Ｖ字形状またはＵ字形状の切り込み（１１０ａ）を入れ、この切り込み（１１０ａ）を介して第１流体通路（１１０）とヘッダタンク（２１１）とを連通させ、第１流体と第２流体との熱交換を行わせることを特徴とする。
【００１１】
これにより、多孔扁平チューブ（１００）内の第１流体通路（１１０）とヘッダタンク（２１１）との連通構造が簡単となってコストを抑えられるうえ気密信頼性も向上させることができる。
【００１２】
請求項７の発明では、多孔扁平チューブ（１００）の第２面に幅方向に渡って所定深さの矩形形状、Ｖ字形状またはＵ字形状の切り込み（１２０ａ）を入れ、この切り込み（１２０ａ）を介して第２流体通路（１２０）とヘッダタンク（２２１）とを連通させことを特徴とする。これにより、多孔扁平チューブ（１００）内の第２流体通路（１２０）とヘッダタンク（２２１）との連通構造が簡単となってコストを抑えられるうえ気密信頼性も向上させることができる。
【００１３】
因みに、上記各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示す一例である。
【００１４】
【発明の実施の形態】
以下、本発明の実施形態を図に基づいて説明する。
【００１５】
（第１実施形態）
図１は、本実施形態における冷凍サイクルの模式図であり、車両等に用い、二酸化炭素（ＣＯ2）等の高圧の冷媒を使用する冷凍サイクルである。コンプレッサで冷媒を圧縮し、ガスクーラで冷却し、膨張弁で減圧し、エバポレータで蒸発させる通常の冷凍サイクルに加え、システムの効率（性能）を向上させるため、エバポレータ下流の低温低圧冷媒とガスクーラ下流の高温高圧冷媒とを熱交換させてガスクーラ下流の冷媒温度を下げる内部熱交換器を備えている。
【００１６】
本実施形態は、その内部熱交換器に本発明の熱交換器を用いたもので、図２に本発明の第１実施形態における熱交換器の斜視図を示し、図３にその熱交換器の構造を部分断面側面図で示す。但し、長手方向の中央から対称構造となっているため片側だけで説明する。
【００１７】
多孔扁平チューブ１００は、アルミニウム材の押出成形で多数の流体通路孔１００ａが形成されており、その多数の流体通路孔１００ａが図４（ｂ）に示すように偏平状な断面の厚み方向に複数の列状に配置されている。本実施形態では流体通路孔１００ａが２列に配置された多孔扁平チューブ１００を熱交換器の熱交換部に用い、一方の列を第１流体通路１１０とし第１流体として高温高圧冷媒を流通させ、他方の列を第２流体通路１２０とし第２流体として低温低圧冷媒を流通させて熱交換を行わせている。
【００１８】
具体的には図３に示すように、多孔扁平チューブ１００の両端近傍で、第１流体通路１１０側面にその第１流体通路１１０の開口部となる切り込み１１０ａを多孔扁平チューブ１００の幅方向に渡って所定深さだけ切り込んで設けている。
【００１９】
また、反対の第２流体通路１２０側面にその第２流体通路１２０の開口部となる切り込み１２０ａを多孔扁平チューブ１００の幅方向に渡って所定深さだけ切り込んで設けている。
【００２０】
この両切り込み１１０ａ、１２０ａは、図４（ｂ）に示すようにメタルソー等で加工され、加工コストは安く、回転する刃具方向に流体通路孔１００ａがないため、削った切り粉が入り込んで詰まるという問題もない。その点から切り込み１１０ａ、１２０ａの形状は実施例のような矩形形状が望ましいが、Ｖ字形状やＵ字形状であっても良い。
【００２１】
この両切り込み１１０ａ、１２０ａの位置は多孔扁平チューブ１００の長手方向に対して少しずらして設けてある。そして、図２、図３に示すように、この多孔扁平チューブ１００の両端にアルミニウム製のパイプ材を２本づつ挿入して接合する。切り込み１１０ａの回りに接合したパイプ材は第１流体通路１１０と連通する第１ヘッダパイプ（タンク）２１０となり、切り込み１２０ａの回りに接合したパイプ材は第２流体通路１２０と連通する第２ヘッダパイプ（タンク）２２０となる。
【００２２】
各第１、第２ヘッダパイプ２１０、２２０は、従来技術は径の違うパイプ材に形状の違う長孔を明けていたのに対し、本実施形態ではパイプ材の両側面中央に長孔２３０を明けた一種類のパイプ加工品でだけ良い。また、明ける長孔２３０も、多孔扁平チューブ１００の外形のまま挿通させるため長円形で、プレス加工も接合も容易な形状となる。これらのことより、熱交換器のコストを抑えられるうえ気密信頼性も向上させることができる。
【００２３】
そして、各第１、第２ヘッダパイプ２１０、２２０の流体出入口となる部分には配管接続ブロック２４０が接合され、流体出入口とならない反対側にはキャップ２５０が接合されて封止される。尚、上記に構成した部分は組み合わせたうえ治具により保持され、ろう付け用加熱炉内に搬入されて一体ろう付けされる。また、多孔扁平チューブ１００の両端の切断部はろう材１３０が盛られて第１、第２流体通路１１０、１２０とも封止される。
【００２４】
以上の構成において本実施形態の第１、第２流体の流れ経路を説明すると、第１流体は、図２中の矢印に示すように、一方の第１ヘッダパイプ２１０内に流入し、一方の切り込み１１０ａから第１流体通路１１０に分配される。そして、第１流体通路１１０を流れ、他方の切り込み１１０ａから他方の第１ヘッダパイプ２１０内に流れ出して集合され、矢印に示すように他方の第１ヘッダパイプ２１０から流出する。
【００２５】
また、第２流体は、図２中の矢印に示すように、一方の第２ヘッダパイプ２２０内に流入し、一方の切り込み１２０ａから第２流体通路１２０に分配される。そして、第２流体通路１２０を流れ、他方の切り込み１２０ａから他方の第２ヘッダパイプ２２０内に流れ出して集合され、矢印に示すように他方の第２ヘッダパイプ２２０から流出する。よって、図２の矢印から分かるように、第１流体の流れと第２流体の流れは対向流となっているが、平行流であっても良い。
【００２６】
次に、本実施形態での特徴を述べる。多孔扁平チューブ１００の両面に、幅方向に渡って所定深さの切り込み１１０ａ、１２０ａを入れ、この切り込み１１０ａ、１２０ａより流体通路孔１００ａとヘッダタンク２１１、２２１とを連通させる構造となっている。
【００２７】
これにより、多孔扁平チューブ１００内の流体通路孔１００ａと各ヘッダタンク２１１、２２１との連通構造が簡単となってコストを抑えられるうえ気密信頼性も向上させることができる。
【００２８】
（第２実施形態）
図５は、本発明の第２実施形態における熱交換器の構造を示す部分断面側面図であり、第１実施形態とヘッダタンク２１１、２２１の構造のみ異なる。
【００２９】
上述の第１実施形態ではパイプ材を用いてヘッダパイプ２１１、２２１としていたが、本実施形態ではアルミニウムの部材にプレス加工や切削加工を施した板状の金属加工品２１１、２２１を、多孔扁平チューブ１００の片面にろう付け接合して切り込み１１０ａ、１２０ａを被うことで、金属加工品２１１、２２１をヘッダタンク２１１、２２１としている。これにより、ヘッダタンク２１１、２２１を必要部分の多孔扁平チューブ１００の片面にだけに突出させたコンパクトな熱交換器とすることができる。
【００３０】
（第３実施形態）
図６は、本発明の第３実施形態における熱交換器の構造を示す部分断面側面図であり、第１実施形態と多孔扁平チューブ１００両端の封止構造のみ異なる。
【００３１】
上述の第１実施形態では多孔扁平チューブ１００の両端の切断部にろう材１３０を盛って封止していたが、本実施形態では多孔扁平チューブ１００を幅方向に渡って厚み方向に潰した潰し部１００ｂを設けることにより、流体通路孔１００ａの流通を封止している。これにより、簡単な加工で流体通路孔１００ａの流通を封止できるので、熱交換器のコストを抑えることができる。
【００３２】
（第４実施形態）
図７は、本発明の第４実施形態における熱交換器の構造を示す部分断面側面図であり、これも第１実施形態と多孔扁平チューブ１００両端の封止構造のみ異なる。
【００３３】
本実施形態ではアルミニウム製の封止部品１４０を作り切り込み１１０ａ、１２０ａに嵌めて接合することにより、流体通路孔１００ａの流通を封止している。これにより、切り込み１１０ａ、１２０ａと封止部品１４０とを組み合わせることで簡単に流体通路孔１００ａの流通を封止でき、熱交換器の気密信頼性を向上することができる。
【００３４】
（第５実施形態）
図８は、本発明の第５実施形態における熱交換器の構造を示す部分断面側面図であり、第１実施形態とは第２流体通路１２０と第２ヘッダパイプ２２０との連通構造が異なる。
【００３５】
本実施形態では第１流体通路１１０と第１ヘッダパイプ２１０との連通構造は第１実施形態と同じであるが、第２ヘッダパイプ２２０に明ける長孔２３０は片側にだけとし、多孔扁平チューブ１００の端部をそのまま挿通して接合することで第２流体通路１２０と第２ヘッダパイプ２２０との連通を取っている。
【００３６】
よって多孔扁平チューブ１００の第２流体通路１２０側面に切り込み１２０ａを設けていないが、その代わりに両第１、第２ヘッダパイプ２１０、２２０の間の第１流体通路１１０側面にもう１つ切れ込み１１０ａを設け、そこに第４実施形態の封止部品１４０を嵌めて接合することにより、第１流体通路１１０まで第２ヘッダパイプ２２０と連通しないようにしている。この構造は第２ヘッダパイプ２２０から多孔扁平チューブ１００が突出しないため、熱交換器をコンパクトにすることができる。
【００３７】
（第６実施形態）
図９は、本発明の第６実施形態における熱交換器の構造を示す部分断面側面図である。本実施形態では流体通路孔１００ａが３列に配置された多孔扁平チューブ１００を熱交換器の熱交換部に用い、外側の２列を第１流体通路１１０とし第１流体として高温高圧冷媒を流通させ、中央の１列を第２流体通路１２０とし第２流体として低温低圧冷媒を流通させて熱交換を行わせている。
【００３８】
よって多孔扁平チューブ１００の両面に切れ込み１１０ａを設け、その両面の切れ込み１１０ａの回りに第１ヘッダパイプ２１０を接合することにより両面の第１流体通路１１０と連通を取っている。また、両第１、第２ヘッダパイプ２１０、２２０の間の両面にもう２つ切れ込み１１０ａを設け、そこに第４実施形態の封止部品１４０をそれぞれ嵌めて接合することにより、両第１流体通路１１０が第２ヘッダパイプ２２０と連通しないようにしている。
【００３９】
そして第５実施形態と同じく、第２ヘッダパイプ２２０に明ける長孔２３０は片側だけとし、多孔扁平チューブ１００の端部をそのまま挿通して接合することで中央の第２流体通路１２０と第２ヘッダパイプ２２０との連通を取っている。
【００４０】
このように、流体通路孔１００ａが多数列に配置された多孔扁平チューブ１００においても、切れ込みを設ける面や切れ込みの深さを可変し、更には切れ込みと封止部品を組み合わせることにより、どの列をどこと連通させるか等が可変でき、様々な流体通路列の組み合わせができる熱交換器となる。
【００４１】
尚、外側の２列を第２流体通路１２０とし第２流体として低温低圧冷媒を流通させ、中央の１列を第１流体通路１１０とし第１流体として高温高圧冷媒を流通させても良い。
【図面の簡単な説明】
【図１】本実施形態における冷凍サイクルの模式図である。
【図２】本発明の第１実施形態における熱交換器を示す斜視図である。
【図３】本発明の第１実施形態における熱交換器の構造を示す部分断面側面図である。
【図４】多孔扁平チューブの加工方法概要を示し、（ａ）は従来構造の場合、（ｂ）は本発明の実施形態における場合である。
【図５】本発明の第２実施形態における熱交換器の構造を示す部分断面側面図である。
【図６】本発明の第３実施形態における熱交換器の構造を示す部分断面側面図である。
【図７】本発明の第４実施形態における熱交換器の構造を示す部分断面側面図である。
【図８】本発明の第５実施形態における熱交換器の構造を示す部分断面側面図である。
【図９】本発明の第６実施形態における熱交換器の構造を示す部分断面側面図である。
【符号の説明】
１００ 多孔扁平チューブ
１００ａ 流体通路孔
１００ｂ 潰し部
１１０ 第１流体通路
１１０ａ 切り込み
１２０ 第２流体通路
１２０ａ 切り込み
１４０ 封止部品
２１１ 第１ヘッダパイプ（ヘッダタンク、金属加工品）
２２１ 第２ヘッダパイプ（ヘッダタンク、金属加工品）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger using a porous flat tube in which a plurality of fluid passage holes formed by extrusion molding are arranged in a plurality of rows in a cross-sectional thickness direction as a heat exchange section. For example, the first fluid and the second fluid are allowed to flow through the passage hole to perform heat exchange.
[0002]
[Prior art]
As a conventional technique, a porous flat tube in which a large number of fluid passage holes formed by extrusion molding are arranged in a plurality of rows in the cross-sectional thickness direction is used for the heat exchange part, and for each row of the plurality of rows of fluid passage holes, For example, a heat exchanger is known in which heat exchange is performed by circulating a high-temperature and high-pressure refrigerant as a first fluid and a low-temperature and low-pressure refrigerant as a second fluid. For example, there exists the structure of the heat exchanger shown in Unexamined-Japanese-Patent No. 2000-346484 for which this applicant applied previously.
[0003]
[Problems to be solved by the invention]
However, in the conventional structure shown in the above publication, it is necessary to cut the end of the porous flat tube 100 into a shape as shown in FIG. 4A with a milling cutter or the like. In addition to being expensive, the fluid passage hole 100a opens in the direction of the rotating cutting tool, so that the shaved chips enter and become clogged. (The reference numerals in the figure correspond to the embodiments described later.)
In addition, the long hole for inserting the shaved porous flat tube 100 into the outer header tank (pipe) of the double pipe is an oval shape and is easy to press, but the inner header tank ( The long hole to be inserted into the pipe) has a substantially D-shaped shape with sharp corners on both sides and is difficult to press. From this, the D-shaped outer shape of the porous flat tube 100 and the inner header tank Even if the airtightness of the joint (brazing) with the (pipe) is incomplete, there is a problem that it is difficult to detect because of internal leakage.
[0004]
The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to simplify the communication structure between the fluid passage hole in the porous flat tube and the header tank, thereby reducing the cost and airtight reliability. It is in providing the heat exchanger which can also improve.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following technical means. In the first aspect of the present invention, heat exchange using a porous flat tube (100) in which a plurality of fluid passage holes (100a) formed by extrusion molding are arranged in a plurality of rows in the cross-sectional thickness direction is used as a heat exchange section. In the container, it is a flat surface of the porous flat tube (100), and on the side surface of one row of the fluid passage holes (100a), only in the one row of the fluid passage holes (100a) across the width direction. A rectangular, V-shaped, or U-shaped cut (110a, 120a) having a predetermined depth to be an opening is made, and a header tank (210, 220, 211, 221) is formed around the cut (110a, 120a). ) joining causes the cuts (110a, 120a) communicating the with one column and the header tank (210,220,211,221) of said fluid passage hole (100a) through the And said that you are.
[0006]
As a result, the communication structure between the fluid passage hole (100a) in the porous flat tube (100) and each header tank ( 210, 220, 211 , 221) is simplified, the cost is reduced, and the airtight reliability is improved. be able to.
In the invention according to claim 2, the notch (110a, 120a) having a predetermined depth is formed in the width direction on the flat surface of the porous flat tube (100) so that the flat surface remains on both sides of the notch (110a, 120a). The header tanks (210, 220, 211, 221) are joined around the notches (110a, 120a), and the fluid passage hole (100a) and the header tanks (210, 220, 210) are joined through the notches (110a, 120a). 211, 221). This simplifies the communication structure between the fluid passage hole (100a) in the porous flat tube (100) and the header tanks (210, 220, 211, 221), thereby reducing costs and improving airtight reliability. be able to.
[0007]
In invention of Claim 3 , a plate-shaped metal workpiece (211, 221) is joined to the flat surface of a porous flat tube (100), and a metal workpiece (211, 120a) is covered by cutting (110a, 120a). 221) is a header tank (211, 221). Thereby, it can be set as the compact heat exchanger which made the header tank (211, 221) protrude only on the single side | surface of the porous flat tube (100) of a required part.
[0008]
The invention according to claim 4 is characterized in that the flow passage of the fluid passage hole (100a) is sealed by providing a crushing portion (100b) obtained by crushing the porous flat tube (100) in the thickness direction across the width direction. And Thereby, since the circulation of the fluid passage hole (100a) can be sealed by simple processing, the cost of the heat exchanger can be suppressed.
[0009]
The invention according to claim 5 is characterized in that the flow of the fluid passage hole (100a) is sealed by joining the sealing component (140) to the notches (110a, 120a). Thereby, the circulation of the fluid passage hole (100a) can be easily sealed by combining the notches (110a, 120a) and the sealing component (140), and the hermetic reliability of the heat exchanger can be improved.
[0010]
In the invention according to claim 6, the porous flat tube (100) includes a first fluid passage (110) configured on a first surface side and configured by a part of a fluid passage hole (100a) through which the first fluid flows. And a second fluid passage (120) configured on the other side of the second surface opposite to the first surface and configured by the other part of the fluid passage hole (100a) through which the second fluid flows, and at least a porous flat tube A rectangular, V-shaped or U-shaped cut (110a) having a predetermined depth is made in the first surface of (100) in the width direction, and the first fluid passage (110) is inserted through the cut (110a). And the header tank (211) are in communication with each other to exchange heat between the first fluid and the second fluid.
[0011]
Thereby, the communication structure between the first fluid passage (110) and the header tank (211) in the porous flat tube (100) is simplified, the cost can be reduced, and the airtight reliability can be improved.
[0012]
In the invention of claim 7, a rectangular, V-shaped or U-shaped cut (120a) having a predetermined depth is made in the second surface of the porous flat tube (100) in the width direction, and the cut (120a). The second fluid passageway (120) and the header tank (221) are communicated with each other through the above. Thereby, the communication structure between the second fluid passage (120) in the porous flat tube (100) and the header tank (221) is simplified, the cost can be reduced, and the airtight reliability can be improved.
[0013]
Incidentally, the reference numerals in parentheses of each means described above are an example showing the correspondence with the specific means described in the embodiments described later.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
(First embodiment)
FIG. 1 is a schematic diagram of a refrigeration cycle in the present embodiment, and is a refrigeration cycle that is used in a vehicle or the like and uses a high-pressure refrigerant such as carbon dioxide (CO 2 ). In order to improve the efficiency (performance) of the system, in addition to the normal refrigeration cycle in which the refrigerant is compressed by the compressor, cooled by the gas cooler, depressurized by the expansion valve, and evaporated by the evaporator, the low-temperature and low-pressure refrigerant downstream of the evaporator and the gas cooler downstream An internal heat exchanger that lowers the refrigerant temperature downstream of the gas cooler by exchanging heat with the high-temperature and high-pressure refrigerant is provided.
[0016]
This embodiment uses the heat exchanger of the present invention as its internal heat exchanger. FIG. 2 shows a perspective view of the heat exchanger in the first embodiment of the present invention, and FIG. 3 shows the heat exchanger. This structure is shown in a partial sectional side view. However, since it has a symmetrical structure from the center in the longitudinal direction, only one side will be described.
[0017]
In the porous flat tube 100, a large number of fluid passage holes 100a are formed by extrusion molding of an aluminum material, and a plurality of fluid passage holes 100a are provided in the thickness direction of a flat cross section as shown in FIG. Are arranged in rows. In the present embodiment, the porous flat tubes 100 in which the fluid passage holes 100a are arranged in two rows are used for the heat exchange part of the heat exchanger, and one row is used as the first fluid passage 110 and the high-temperature and high-pressure refrigerant is circulated as the first fluid. The other row is the second fluid passage 120, and a low-temperature and low-pressure refrigerant is circulated as the second fluid for heat exchange.
[0018]
Specifically, as shown in FIG. 3, in the vicinity of both ends of the porous flat tube 100, a notch 110 a serving as an opening of the first fluid passage 110 is formed on the side surface of the first fluid passage 110 in the width direction of the porous flat tube 100. And cut to a predetermined depth.
[0019]
In addition, a notch 120 a serving as an opening portion of the second fluid passage 120 is provided on the opposite side surface of the second fluid passage 120 by cutting a predetermined depth in the width direction of the porous flat tube 100.
[0020]
Both the cuts 110a and 120a are processed with a metal saw or the like as shown in FIG. 4 (b), the processing cost is low, and there is no fluid passage hole 100a in the direction of the rotating blade, so that the cut chips enter and become clogged. There is no problem. From this point, the shapes of the cuts 110a and 120a are preferably rectangular as in the embodiment, but may be V-shaped or U-shaped.
[0021]
The positions of both cuts 110a and 120a are slightly shifted from the longitudinal direction of the porous flat tube 100. Then, as shown in FIGS. 2 and 3, two aluminum pipe members are inserted and joined to both ends of the porous flat tube 100. The pipe material joined around the notch 110 a becomes the first header pipe (tank) 210 communicating with the first fluid passage 110, and the pipe material joined around the notch 120 a communicates with the second fluid passage 120. (Tank) 220.
[0022]
Each of the first and second header pipes 210 and 220 has a long hole 230 having a different shape in the pipe material having a different diameter in the prior art, whereas in this embodiment, the long hole 230 is formed at the center of both side surfaces of the pipe material. Only one kind of finished pipe product is enough. Moreover, since the elongated long hole 230 is inserted in the outer shape of the porous flat tube 100, it is oval and has a shape that can be easily pressed and joined. As a result, the cost of the heat exchanger can be reduced and the airtight reliability can be improved.
[0023]
Then, a pipe connection block 240 is joined to a portion serving as a fluid inlet / outlet of each of the first and second header pipes 210 and 220, and a cap 250 is joined and sealed to the opposite side not serving as a fluid inlet / outlet. The parts configured as described above are combined, held by a jig, carried into a brazing heating furnace, and integrally brazed. Moreover, the brazing material 130 is piled up at the cut portions at both ends of the porous flat tube 100 to seal the first and second fluid passages 110 and 120 together.
[0024]
The flow paths of the first and second fluids of the present embodiment in the above configuration will be described. The first fluid flows into one first header pipe 210 as shown by an arrow in FIG. Distributed from the notch 110 a to the first fluid passage 110. Then, it flows through the first fluid passage 110, flows out from the other notch 110 a into the other first header pipe 210, is collected, and flows out from the other first header pipe 210 as indicated by an arrow.
[0025]
Further, as shown by the arrow in FIG. 2, the second fluid flows into one second header pipe 220 and is distributed to the second fluid passage 120 from one notch 120a. Then, it flows through the second fluid passage 120, flows out from the other notch 120a into the other second header pipe 220, collects, and flows out from the other second header pipe 220 as indicated by an arrow. Therefore, as can be seen from the arrows in FIG. 2, the flow of the first fluid and the flow of the second fluid are counterflows, but they may be parallel flows.
[0026]
Next, features of this embodiment will be described. Cuts 110a and 120a having a predetermined depth are formed in both sides of the porous flat tube 100 in the width direction, and the fluid passage hole 100a and the header tanks 211 and 221 are communicated with each other through the cuts 110a and 120a.
[0027]
Thereby, the communication structure between the fluid passage hole 100a in the porous flat tube 100 and the header tanks 211 and 221 is simplified, the cost can be suppressed, and the airtight reliability can be improved.
[0028]
(Second Embodiment)
FIG. 5 is a partial cross-sectional side view showing the structure of the heat exchanger in the second embodiment of the present invention, which is different from the first embodiment only in the structures of the header tanks 211 and 221.
[0029]
In the first embodiment described above, the pipe pipes are used as the header pipes 211 and 221. However, in this embodiment, the plate-like metal workpieces 211 and 221 obtained by subjecting an aluminum member to press working or cutting work are made porous flat. The metal workpieces 211 and 221 are used as the header tanks 211 and 221 by brazing and joining one side of the tube 100 and covering the cuts 110a and 120a. Thereby, it can be set as the compact heat exchanger which made the header tank 211,221 protrude only on the single side | surface of the porous flat tube 100 of a required part.
[0030]
(Third embodiment)
FIG. 6 is a partial cross-sectional side view showing the structure of the heat exchanger in the third embodiment of the present invention, which is different from the first embodiment only in the sealing structure at both ends of the porous flat tube 100.
[0031]
In the first embodiment described above, the brazing filler metal 130 is placed and sealed at the cut ends of the porous flat tube 100, but in this embodiment, the porous flat tube 100 is crushed in the thickness direction across the width direction. By providing the portion 100b, the flow of the fluid passage hole 100a is sealed. Thereby, since the distribution | circulation of the fluid passage hole 100a can be sealed by simple process, the cost of a heat exchanger can be held down.
[0032]
(Fourth embodiment)
FIG. 7 is a partial cross-sectional side view showing the structure of the heat exchanger according to the fourth embodiment of the present invention, which also differs from the first embodiment only in the sealing structure at both ends of the porous flat tube 100.
[0033]
In the present embodiment, the flow of the fluid passage hole 100a is sealed by making an aluminum sealing component 140 and fitting it into the cuts 110a and 120a. Thereby, the flow of the fluid passage hole 100a can be easily sealed by combining the notches 110a and 120a and the sealing component 140, and the airtight reliability of the heat exchanger can be improved.
[0034]
(Fifth embodiment)
FIG. 8 is a partial cross-sectional side view showing the structure of the heat exchanger in the fifth embodiment of the present invention, and the communication structure of the second fluid passage 120 and the second header pipe 220 is different from that of the first embodiment.
[0035]
In this embodiment, the communication structure between the first fluid passage 110 and the first header pipe 210 is the same as in the first embodiment, but the long hole 230 opened in the second header pipe 220 is only on one side, and the porous flat tube 100 The second fluid passage 120 and the second header pipe 220 are in communication with each other by inserting and joining the end portions thereof.
[0036]
Therefore, the notch 120a is not provided on the side surface of the second fluid passage 120 of the porous flat tube 100. Instead, another notch 110a is provided on the side surface of the first fluid passage 110 between the first and second header pipes 210 and 220. And the sealing component 140 of the fourth embodiment is fitted and joined thereto so that the second header pipe 220 is not communicated to the first fluid passage 110. In this structure, since the porous flat tube 100 does not protrude from the second header pipe 220, the heat exchanger can be made compact.
[0037]
(Sixth embodiment)
FIG. 9 is a partial cross-sectional side view showing the structure of the heat exchanger in the sixth embodiment of the present invention. In the present embodiment, the porous flat tubes 100 in which the fluid passage holes 100a are arranged in three rows are used for the heat exchange part of the heat exchanger, and the outer two rows are the first fluid passages 110 and the high-temperature and high-pressure refrigerant is circulated as the first fluid. Then, the central row is the second fluid passage 120, and the low-temperature and low-pressure refrigerant is circulated as the second fluid for heat exchange.
[0038]
Therefore, cuts 110a are provided on both sides of the porous flat tube 100, and the first header pipe 210 is joined around the cuts 110a on both sides, thereby communicating with the first fluid passages 110 on both sides. In addition, two cuts 110a are provided on both surfaces between the first and second header pipes 210 and 220, and the sealing parts 140 of the fourth embodiment are respectively fitted and joined to the two first fluids. The passage 110 is prevented from communicating with the second header pipe 220.
[0039]
Similarly to the fifth embodiment, the elongated hole 230 opened in the second header pipe 220 is only on one side, and the end of the porous flat tube 100 is inserted and joined as it is, so that the second fluid passage 120 and the second header in the center are joined. Communication with the pipe 220 is established.
[0040]
As described above, even in the porous flat tube 100 in which the fluid passage holes 100a are arranged in a plurality of rows, the surface on which the cut is provided and the depth of the cut are variable, and further, by combining the cut and the sealing component, It is possible to change where to communicate with, and the heat exchanger can be combined with various fluid passage arrays.
[0041]
The outer two rows may be the second fluid passage 120 and the low temperature and low pressure refrigerant may be circulated as the second fluid, and the central one row may be the first fluid passage 110 and the high temperature and high pressure refrigerant may be circulated as the first fluid.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a refrigeration cycle in the present embodiment.
FIG. 2 is a perspective view showing a heat exchanger in the first embodiment of the present invention.
FIG. 3 is a partial cross-sectional side view showing the structure of the heat exchanger in the first embodiment of the present invention.
4A and 4B show an outline of a processing method of a porous flat tube, in which FIG. 4A shows a case of a conventional structure, and FIG. 4B shows a case of an embodiment of the present invention.
FIG. 5 is a partial cross-sectional side view showing the structure of a heat exchanger in a second embodiment of the present invention.
FIG. 6 is a partial cross-sectional side view showing the structure of a heat exchanger in a third embodiment of the present invention.
FIG. 7 is a partial sectional side view showing the structure of a heat exchanger according to a fourth embodiment of the present invention.
FIG. 8 is a partial cross-sectional side view showing the structure of a heat exchanger in a fifth embodiment of the present invention.
FIG. 9 is a partial cross-sectional side view showing the structure of a heat exchanger in a sixth embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 Perforated flat tube 100a Fluid passage hole 100b Collapsed part 110 First fluid passage 110a Cut 120 Second fluid passage 120a Cut 140 Sealing component 211 First header pipe (header tank, metal workpiece)
221 Second header pipe (header tank, metal processed product)

Claims (7)

押出成形で形成される多数の流体通路孔（１００ａ）が断面厚み方向に複数の列状に配置された多孔扁平チューブ（１００）を熱交換部に用いた熱交換器において、
前記多孔扁平チューブ（１００）の扁平面であって、前記流体通路孔（１００ａ）の一方の列の側面に、幅方向に渡って前記流体通路孔（１００ａ）の前記一方の列の開口部となる所定深さの矩形形状、Ｖ字形状またはＵ字形状の切り込み（１１０ａ、１２０ａ）を入れ、この切り込み（１１０ａ、１２０ａ）の回りにヘッダタンク（２１０、２２０、２１１、２２１）を接合し、前記切り込み（１１０ａ、１２０ａ）を介して前記流体通路孔（１００ａ）の前記一方の列と前記ヘッダタンク（２１０、２２０、２１１、２２１）とを連通させていることを特徴とする熱交換器。In a heat exchanger using a porous flat tube (100) in which a plurality of fluid passage holes (100a) formed by extrusion are arranged in a plurality of rows in a cross-sectional thickness direction as a heat exchange part,
An opening of the one row of the fluid passage holes (100a) across the width direction on a side surface of one row of the fluid passage holes (100a), which is a flat surface of the porous flat tube (100). A rectangular, V-shaped or U-shaped cut (110a, 120a) having a predetermined depth is inserted, and a header tank (210, 220, 211, 221) is joined around the cut (110a, 120a), The heat exchanger, wherein the one row of the fluid passage holes (100a) and the header tanks (210, 220, 211, 221) are communicated with each other through the notches (110a, 120a). 押出成形で形成される多数の流体通路孔（１００ａ）が断面厚み方向に複数の列状に配置された多孔扁平チューブ（１００）を熱交換部に用いた熱交換器において、
前記多孔扁平チューブ（１００）の扁平面に、幅方向に渡って所定深さの切り込み（１１０ａ、１２０ａ）を当該切り込み（１１０ａ、１２０ａ）の両側に前記扁平面が残るように入れ、この切り込み（１１０ａ、１２０ａ）の回りにヘッダタンク（２１０、２２０、２１１、２２１）を接合し、前記切り込み（１１０ａ、１２０ａ）を介して前記流体通路孔（１００ａ）と前記ヘッダタンク（２１０、２２０、２１１、２２１）とを連通させていることを特徴とする熱交換器。In a heat exchanger using a porous flat tube (100) in which a plurality of fluid passage holes (100a) formed by extrusion are arranged in a plurality of rows in a cross-sectional thickness direction as a heat exchange part,
In the flat surface of the porous flat tube (100), cuts (110a, 120a) having a predetermined depth in the width direction are made so that the flat surfaces remain on both sides of the cuts (110a, 120a). 110a, 120a) around the header tanks (210, 220, 211, 221), and through the notches (110a, 120a), the fluid passage hole (100a) and the header tanks (210, 220, 211, 221) is in communication with the heat exchanger. 板状の金属加工品（２１１、２２１）を前記多孔扁平チューブ（１００）の片面に接合して前記切り込み（１１０ａ、１２０ａ）を被うことで前記金属加工品（２１１、２２１）を前記ヘッダタンク（２１１、２２１）としたことを特徴とする請求項１または請求項２に記載の熱交換器。  A plate-shaped metal workpiece (211, 221) is joined to one side of the porous flat tube (100) and the cuts (110a, 120a) are covered, whereby the metal workpiece (211, 221) is covered with the header tank The heat exchanger according to claim 1, wherein the heat exchanger is (211, 221). 前記多孔扁平チューブ（１００）を幅方向に渡って厚み方向に潰した潰し部（１００ｂ）を設けることにより、前記流体通路孔（１００ａ）の流通を封止したことを特徴とする請求項１ないし請求項３のうちいずれか１項に記載の熱交換器。  2. The flow path of the fluid passage hole (100 a) is sealed by providing a crushing part (100 b) obtained by crushing the porous flat tube (100) in the thickness direction in the width direction. The heat exchanger according to any one of claims 3 to 4. 前記切り込み（１１０ａ、１２０ａ）に封止部品（１４０）を接合することにより、前記流体通路孔（１００ａ）の流通を封止したことを特徴とする請求項１ないし請求項３のうちいずれか１項に記載の熱交換器。  4. The flow path of the fluid passage hole (100 a) is sealed by joining a sealing component (140) to the cuts (110 a, 120 a). 5. The heat exchanger according to item. 押出成形で形成される多数の流体通路孔（１００ａ）が断面厚み方向に複数の列状に配置された多孔扁平チューブ（１００）を熱交換部に用いた熱交換器において、
前記多孔扁平チューブ（１００）は、第１面側に配置され第１流体が流通する前記流体通路孔（１００ａ）の一部で構成された第１流体通路（１１０）と、第１面と反対側の第２面側に配置され第２流体が流通する前記流体通路孔（１００ａ）の他部で構成された第２流体通路（１２０）とを有し、少なくとも前記多孔扁平チューブ（１００）の第１面に幅方向に渡って所定深さの矩形形状、Ｖ字形状またはＵ字形状の切り込み（１１０ａ）を入れ、この切り込み（１１０ａ）を介して前記第１流体通路（１１０）とヘッダタンク（２１１）とを連通させ、前記第１流体と前記第２流体との熱交換を行わせることを特徴とする熱交換器。In a heat exchanger using a porous flat tube (100) in which a plurality of fluid passage holes (100a) formed by extrusion are arranged in a plurality of rows in a cross-sectional thickness direction as a heat exchange part,
The porous flat tube (100) is disposed on the first surface side and is opposite to the first surface, the first fluid passage (110) configured by a part of the fluid passage hole (100a) through which the first fluid flows. A second fluid passage (120) configured at the other portion of the fluid passage hole (100a) disposed on the second surface side of the fluid passage through which the second fluid flows, and at least of the porous flat tube (100). A rectangular, V-shaped or U-shaped cut (110a) having a predetermined depth is formed in the first surface in the width direction, and the first fluid passage (110) and the header tank are inserted through the cut (110a). (211) is connected, and heat exchange between the first fluid and the second fluid is performed. 前記多孔扁平チューブ（１００）の第２面に幅方向に渡って所定深さの矩形形状、Ｖ字形状またはＵ字形状の切り込み（１２０ａ）を入れ、この切り込み（１２０ａ）を介して前記第２流体通路（１２０）とヘッダタンク（２２１）とを連通させことを特徴とする請求項６に記載の熱交換器。A rectangular, V-shaped or U-shaped notch (120a) having a predetermined depth is formed in the second surface of the porous flat tube (100) in the width direction, and the second through the notch (120a). The heat exchanger according to claim 6, wherein the fluid passage (120) and the header tank (221) are communicated with each other.
JP2002000637A 2002-01-07 2002-01-07 Heat exchanger Expired - Fee Related JP3826791B2 (en)

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