JP4105320B2 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
JP4105320B2
JP4105320B2 JP3827399A JP3827399A JP4105320B2 JP 4105320 B2 JP4105320 B2 JP 4105320B2 JP 3827399 A JP3827399 A JP 3827399A JP 3827399 A JP3827399 A JP 3827399A JP 4105320 B2 JP4105320 B2 JP 4105320B2
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flat tube
heat exchanger
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plate fin
width
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JP2000234883A5 (en
JP2000234883A (en
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幹生 渡辺
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Showa Denko KK
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Showa Denko KK
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00Tubular elements; Assemblies of tubular elements
    • F28F1/10Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05391Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F17/00Removing ice or water from heat-exchange apparatus
    • F28F17/005Means for draining condensates from heat exchangers, e.g. from evaporators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2215/00Fins
    • F28F2215/12Fins with U-shaped slots for laterally inserting conduits

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

【0001】
【発明の属する技術分野】
この発明は、カーエアコン用コンデンサやエバポレータを始めとする各種の冷暖房機、冷凍機等に用いられる熱交換器に関する。
【0002】
【従来の技術】
カーエアコン用のコンデンサやエバポレータ等に使用される熱交換器として、図5に示すように、所要間隔を置いて対峙した一対の丸パイプからなるヘッダー(11A)(11B)間に、各々両端を両ヘッダー(11A)(11B)に連通接続した多数本の偏平チューブ(12)…が相互間にコルゲートフィン(13)を介して平行配置してコア部(14)を構成し、両ヘッダー(11A)(11B)内の仕切り(15)により、導入口(16)から流入する熱交換媒体がチューブ(12)…を通してコア部(14)を蛇行状に流れて導出口(17)に至るように設定されたものが汎用されている。また、上記一対のヘッダーを用いず、一本の偏平チューブを一定長さで折り返す形に曲成した蛇行状のサーペインタインチューブを用い、その多段に配置した直線部間にコルゲートフィンを介在させて同様のコア部を構成したものもある。
【0003】
ところで、これら熱交換器のコア部に使用されるコルゲートフィンは、空気との接触面積を大きくして熱交換効率を高めるものであるが、蛇行状に折り返した形態であるために熱交換に伴って生じる結露水の排水性が悪く、熱交換器が設置状態で図6(イ)の如く偏平チューブ(12)…を水平とするタイプと、同図(ロ)の如く偏平チューブ(12)…を垂直とするタイプのいずれにおいても、図示するようにフィン(13)の狭間に水滴(d)が溜まり易く、これによって熱交換効率が低下したり、偏平チューブ(12)…の腐食劣化が促進されるという難点があった。
【0004】
これに対し、図4(イ)(ロ)に示すように、垂直状態で左右方向に所定間隔置きに配列した多数枚の平板状のプレートフィン(1)…と、これらプレートフィン(1)…の一側端より幅方向に凹入する切欠部(2)…に水平状態で嵌入して上下多段に配置した偏平チューブ(3)…とでコア部(10)を構成した熱交換器(例えば特開平6−50688号公報)では、垂直なプレートフィン(1)…の両側部が偏平チューブ(3)…よりも前後に張出した形になるため、この張出した両側部を伝って水滴が落下し易く、結露水の排水性に優れるという利点がある。なお、図4(イ)におけるコア部(10)の中間部分ではプレートフィン(1)及び偏平チューブ(3)の図示を省略してある。また、図4(イ)中の(4A)(4B)は垂直に配置した丸パイプ状のヘッダー、(5A)は熱交換媒体の導入口、(5B)は同導出口、図4(ロ)中の(1a)はプレートフィン(1)のルーバー加工による凹凸条である。
【0005】
【発明が解決しようとする課題】
しかしながら、上記のようなプレートフィン(1)…と偏平チューブ(3)…とでコア部(10)を構成した熱交換器においても、偏平チューブ(3)…の表面には常時ある程度の結露水が付着した状態となることが避けられず、これによって偏平チューブ(3)…の腐食劣化が進むことになる。また、上記のコア部(10)の構成では、プレートフィン(1)…と偏平チューブ(3)…とを炉中ロウ付けによって一体に接合する必要があるが、この接合のためにプレートフィン(1)…としてブレジングシートを用いた場合、炉中ロウ付け時のロウ材の溶融に伴う肉厚減少によってフィン強度が低下する上、フィンの空気に対する接触性を高める上で一般的に施されるルーバー加工において、使用する金型が磨耗損壊し易くなるという難点もあった。
【0006】
この発明は、上述の事情に鑑みて、垂直状態で左右方向に配列したプレートフィンと、水平状態で上下多段に配置した偏平チューブとでコア部を構成する熱交換器として、結露水による偏平チューブの耐蝕性を大きく向上でき、しかもプレートフィンと偏平チューブとを炉中ロウ付けにて確実に接合一体化でき、またプレートフィンの強度を確保できると共にそのルーバー加工に支障を生じないものを提供することを目的としている。
【0007】
【課題を解決するための手段】
上記目的を達成するために、この発明の請求項1に係る熱交換器は、垂直状態で左右方向に所定間隔置きに配列した多数枚のプレートフィンと、これらプレートフィンの一側端より幅方向に凹入する切欠部に水平状態で嵌入して上下多段に配置した偏平チューブとでコア部が構成され、このコア部の偏平チューブ内を流れる熱交換媒体と外部の空気との間で熱交換を行う熱交換器において、
前記偏平チューブが、その一側端から上下面主要部を覆う側面視略U字形のブレジングシート製のカバー材を介して、前記プレートフィンの切欠部に嵌入されて当該プレートフィンと接合一体化してなることを特徴としている。
【0008】
この請求項1の構成では、偏平チューブはその一側端から上下面主要部をカバー材にて覆われているため、結露水による腐食劣化を生じにくく高い耐久性を発揮する。そして、カバー材がブレジングシートからなるため、炉中ロウ付けの際にカバー材のロウ材によってプレートフィンと偏平チューブとが確実に接合一体化すると共に、プレートフィンはアルミニウム合金等の通常の材質でよいためにロウ付け時の肉厚減少による強度低下がなく、またプレートフィンに対してルーバー加工を支障なく施せる。
【0009】
請求項2の発明は、前記請求項1の熱交換器において、前記偏平チューブ及びカバー材が共にアルミニウム系合金からなり、且つカバー材が偏平チューブの合金材料よりも電位的に卑な合金材料である構成としている。この場合、炉中ロウ付けの際に偏平チューブよりも腐食性の高いカバー材の成分が類似材質の偏平チューブの表面に拡散し、これが犠牲防食材として機能するから、偏平チューブ自体の耐蝕性、耐久性がより向上することになる。
【0010】
請求項3の発明は、前記請求項1又は2の熱交換器において、前記カバー材の外周面に、前記プレートフィンの周縁を嵌合させる溝部を有してなる構成としている。この構成では、コア部を組み立てる際、各プレートフィンの切欠部をカバー材の溝部に嵌合させることにより、プレートフィンを簡単に位置決めして正確に配列させることができる上、嵌合状態でロウ付け接合されるため、コア部全体の接合強度が大きく向上する。
【0011】
【発明の実施の形態】
以下、この発明に係る熱交換器の実施例について、図面を参照して具体的に説明する。図1(イ)(ロ)は第一実施例、図2(イ)(ロ)は第二実施例、図3(イ)〜(ハ)は第三実施例を示す。なお、これら実施例では、既述した図4(イ)(ロ)で示す熱交換器と共通の部分については同一符号を付している。
【0012】
第一実施例を示す図1(イ)(ロ)において、(1)は帯板状のプレートフィン、(3)は内部が仕切り壁(3a)によって幅方向複数本の流路(30)に区割された押出型材よりなる偏平チューブ、(6A)は側面視略U字形に曲成されたブレジングシート製のカバー材である。これらはいずれもアルミニウム合金製であるが、カバー材(6A)の合金材料はZn、Sn、In等の元素添加によって偏平チューブの合金材料よりも電位的に卑な材質に設定されている。
【0013】
プレートフィン(1)は、図4(イ)に示すように、熱交換器のコア部(10)において、多数枚が長手方向を垂直として左右方向に所定間隔置きに配列されるものであり、その一側端より幅方向に凹入する切欠部(2)…が長手方向一定間隔置きに形成されると共に、表面にはルーバー加工によって長手方向に沿う凹凸条(1a)…が設けられている。しかして、各切欠部(2)は、長さが偏平チューブ(3)の幅より大きく、且つ上下幅が偏平チューブ(3)にカバー材(6A)を被せた状態での厚さに略一致するように設定されている。
【0014】
カバー材(6A)は、U字形の曲成状態での幅が偏平チューブ(3)の幅よりも若干短く、且つU字形の内側開き幅が偏平チューブ(3)の厚さと略一致するように設定されている。
【0015】
熱交換器のコア部(10)〔図4(イ)参照〕の組立ては、所定間隔置きに配列させたプレートフィン(1)…の長手方向各位置における切欠部(2)…間にわたり、各偏平チューブ(3)を嵌合させたのち、この嵌合部分の隙間に入り込むようにカバー材(6A)を嵌め込むか、もしくは各偏平チューブ(3)に予めカバー材(6A)を被せた状態として、この両者(3)(6A)を前記切欠部(2)…間にわたり嵌合させることにより、図1(ロ)で示す組立状態とすればよい。そして、図4(イ)で示すようにヘッダー(4A)(4B)及び導出入口(5A)(5B)を含めて熱交換器全体を組み付けた状態で、炉中ロウ付けを行うことにより、全体を接合一体化する。
【0016】
この炉中ロウ付けの際に、カバー材(6A)…のロウ材が溶解することにより、プレートフィン(1)…と偏平チューブ(3)…とがカバー材(6A)…を介して強固に接合一体化するが、同時にカバー材(6A)の成分が偏平チューブ(3)の表面に拡散する。
【0017】
従って、得られる熱交換器においては、各プレートフィン(1)の幅方向両側部が偏平チューブ(3)よりも前後に張出した形態であることによって結露水の水滴が伝い落ち易いことに加えて、偏平チューブ(3)がその一側端から上下面主要部をカバー材(6A)にて覆われ、しかも該偏平チューブ(3)の表面に拡散したカバー材(6A)の成分が犠牲防食材として機能するから、該偏平チューブ(3)は結露水による腐食劣化を生じにくく極めて高い耐久性を発揮する。また、プレートフィン(1)は、ロウ材を含まないためにロウ付け時の肉厚減少がなく、充分なフィン強度を確保できる一方、それ自体の製作時にルーバー加工を支障なく施せる。
【0018】
図2(イ)(ロ)に示す第二実施例では、プレートフィン(1)及び偏平チューブ(3)は前記第一実施例と同様であるが、カバー材(6B)はU字形の曲成状態での幅がプレートフィン(1)の切欠部(2)の長さと略一致するように設定されている。しかして、熱交換器のコア部(10)〔図4(イ)参照〕の組立ては、所定間隔置きに配列させたプレートフィン(1)…の長手方向各位置における切欠部(2)…間にわたり、先にカバー材(6B)をそのU字形の曲がり側を奥側として嵌合させ、この嵌合したカバー材(6B)の内側に偏平チューブ(3)を挿嵌するか、もしくは各カバー材(6B)に偏平チューブ(3)を予め嵌め込んだ状態で、やはりカバー材(6B)の曲がり側を奥側として前記切欠部(2)…間にわたり嵌合させれることにより、図2(ロ)で示す組立状態とすればよい。以降の炉中ロウ付けは前記第一実施例と同様である。
【0019】
この第二実施例の熱交換器は、空気の流れが図2(ロ)中の矢印aで示す方向となる設置状態で使用する。この場合、カバー材(6B)がプレートフィン(1)の切欠部(2)の全体にわたる幅であるため、結露水の水滴は当該カバー材(6B)より張出した片側を伝い落ることになるが、偏平チューブ(3)は全体がカバー材(6B)にて覆われた形になり、また該偏平チューブ(3)の表面に拡散したカバー材(6B)の成分が犠牲防食材として機能するから、前記第一実施例と同様に該偏平チューブ(3)は腐食劣化を生じにくく極めて高い耐久性を発揮する。
【0020】
第三実施例では、前記第一実施例におけるカバー材(6A)に代えて図3(イ)に示すカバー材(6C)を、また前記第二実施例におけるカバー材(6B)に代えて図3(ロ)に示すカバー材(6D)を使用する。これらカバー材(6C)(6D)は、寸法及び形状的にはカバー材(6A)又は(6B)と同様であるが、外周面には幅方向に沿う多数の溝部(60)…がプレートフィン(1)…の配列間隔に対応する間隔で設けてある。
【0021】
従って、熱交換器のコア部(10)〔図4(イ)参照〕の組立てに際し、各プレートフィン(1)の切欠部(2)をカバー材(6C)(6D)の溝部(60)に嵌合させることにより、プレートフィン(1)…を簡単に位置決めして正確に配列させることができる。また得られる熱交換器は、プレートフィン(1)…とカバー材(6C)…又は(6D)…とが上記嵌合状態でロウ付け接合された状態となるから、コア部(60)全体の接合強度が大きく向上する。
【0022】
なお、上記の第一〜第三実施例の熱交換器は図4(イ)で示すように一対のヘッダー(4B)(4B)がコア部(10)の両側に配置したタイプであるが、この発明は、ヘッダー(4B)(4B)がなく、一本の偏平チューブを一定長さで折り返す形に曲成した蛇行状のサーペインタインチューブを用いた熱交換器にも同様に適用できる。すなわち、この後者の熱交換器では、図1〜図3で示す偏平チューブ(3)…がサーペインタインチューブの折り返しによる上下多段の直線部に相当することになる。
【0023】
【発明の効果】
請求項1の発明によれば、垂直状態で左右方向に配列したプレートフィンと、水平状態で上下多段に配置した偏平チューブとでコア部を構成する熱交換器として、偏平チューブの耐蝕性及び耐久性に優れ、しかもプレートフィンと偏平チューブとを炉中ロウ付けにて確実に接合一体化でき、またプレートフィンの強度を確保できると共にそのルーバー加工に支障を生じないものが提供される。
【0024】
請求項2の発明によれば、上記の熱交換器として、偏平チューブの耐蝕性及び耐久性により優れるものが提供される。
【0025】
請求項3の発明によれば、上記の熱交換器として、コア部の組立てが容易であり、且つ該コア部全体の接合強度に優れるものが提供される。
【図面の簡単な説明】
【図1】 この発明の熱交換器の第一実施例を示し、(イ)図は組立て前のコア部の構成部材の斜視図、(ロ)図は組立て後のコア部における要部の縦断側面図である。
【図2】 同第二実施例を示し、(イ)図は組立て前のコア部の構成部材の斜視図、(ロ)図は組立て後のコア部における要部の縦断側面図である。
【図3】 同第三実施例を示し、(イ)図及び(ロ)図はカバー材の斜視図、(ハ)図は組立て後のコア部における要部の縦断正面図である。
【図4】 コア部にプレートフィンと偏平チューブを用いた熱交換器の構成例を示し、(イ)は熱交換器全体の斜視図、(ロ)図はコア部における要部の縦断側面図である。
【図5】 コア部にコルゲートフィンを用いた従来の熱交換器の一例を示す正面図である。
【図6】 コルゲートフィンを用いたコア部の水滴付着状態を示し、(イ)図は偏平チューブが水平である場合の要部の拡大正面図、(ロ)図は偏平チューブが垂直である場合の要部の拡大正面図である。
【符号の説明】
1・・・・・・・・プレートフィン
2・・・・・・・・切欠部
3・・・・・・・・偏平チューブ
6A〜6D・・・・カバー材
10・・・・・・・コア部
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger used for various air conditioners, refrigerators, and the like including condensers and evaporators for car air conditioners.
[0002]
[Prior art]
As shown in FIG. 5, as a heat exchanger used in a condenser or an evaporator for a car air conditioner, both ends are respectively disposed between headers (11A) and (11B) made of a pair of round pipes facing each other at a required interval. A number of flat tubes (12) connected in communication with both headers (11A) and (11B) are arranged in parallel with each other via corrugated fins (13) to form a core portion (14). ) By the partition (15) in (11B), the heat exchange medium flowing in from the inlet (16) flows in a meandering manner through the core (14) through the tube (12) to reach the outlet (17). What has been set is universal. In addition, without using the pair of headers, a corrugated fin is interposed between the linear portions arranged in multiple stages using a serpentine serpentine tube bent into a shape in which one flat tube is folded back at a certain length. Some have the same core.
[0003]
By the way, the corrugated fins used in the core part of these heat exchangers increase the contact area with the air and increase the heat exchange efficiency. The drainage of the condensed water is poor, and when the heat exchanger is installed, the flat tube (12) is horizontal as shown in Fig. 6 (a), and the flat tube (12) is as shown in Fig. 6 (b). As shown in the figure, water drops (d) tend to accumulate between the fins (13) as shown in the figure, which reduces heat exchange efficiency and promotes corrosion deterioration of the flat tube (12). There was a difficulty to be done.
[0004]
On the other hand, as shown in FIGS. 4 (a) and 4 (b), a large number of flat plate fins (1) arranged in the vertical direction at predetermined intervals in the left-right direction, and these plate fins (1). A heat exchanger comprising a core portion (10) with flat tubes (3) placed horizontally in a notch portion (2) that is recessed in the width direction from one side end of the tube (3). In Japanese Patent Laid-Open No. 6-50688), since both sides of the vertical plate fin (1)... Project forward and backward from the flat tube (3). It is easy to do and has the advantage of excellent drainage of condensed water. In addition, illustration of a plate fin (1) and a flat tube (3) is abbreviate | omitted in the intermediate part of the core part (10) in FIG. Also, (4A) and (4B) in FIG. 4 (a) are round pipe-shaped headers arranged vertically, (5A) is a heat exchange medium inlet, (5B) is the outlet, and FIG. 4 (b). The inside (1a) is an uneven strip formed by louver processing of the plate fin (1).
[0005]
[Problems to be solved by the invention]
However, even in the heat exchanger in which the core portion (10) is configured by the plate fins (1) and the flat tubes (3) as described above, a certain amount of condensed water is always present on the surface of the flat tubes (3). It is unavoidable that the state of adhering to the surface of the flat tube (3). In the configuration of the core part (10), the plate fins (1) and the flat tubes (3) need to be joined together by brazing in the furnace. For this joining, the plate fins ( When a brazing sheet is used as 1) ..., it is generally applied to reduce fin strength due to thickness reduction accompanying melting of the brazing material during brazing in the furnace and to improve fin contact with air. In the louver processing, there is a problem that the mold to be used is easily damaged by wear.
[0006]
In view of the above-mentioned circumstances, the present invention provides a flat tube made of condensed water as a heat exchanger that constitutes a core portion with plate fins arranged in the left-right direction in a vertical state and flat tubes arranged in multiple stages in a horizontal state. Corrosion resistance can be greatly improved, and the plate fin and the flat tube can be securely joined and integrated by brazing in the furnace, and the strength of the plate fin can be secured and the louver processing is not hindered. The purpose is that.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a heat exchanger according to claim 1 of the present invention includes a plurality of plate fins arranged at predetermined intervals in the left-right direction in a vertical state, and a width direction from one side end of these plate fins. The core part is composed of a flat tube that is horizontally inserted into the notch part that is recessed into the upper part and arranged in multiple stages, and heat exchange is performed between the heat exchange medium that flows in the flat tube of the core part and external air. In the heat exchanger that performs
The flat tube is fitted into and integrated with the plate fin through a notched portion of the plate fin through a cover material made of a brazing sheet having a substantially U shape in side view covering the upper and lower main parts from one side end thereof. It is characterized by.
[0008]
In the configuration of the first aspect, since the flat tube is covered with the cover material from the one end of the flat tube, the flat tube exhibits high durability that is unlikely to cause corrosion deterioration due to condensed water. And since the cover material consists of a brazing sheet, the plate fin and the flat tube are securely joined and integrated by the brazing material of the cover material when brazing in the furnace, and the plate fin is a normal material such as an aluminum alloy. Therefore, there is no reduction in strength due to thickness reduction during brazing, and louvering can be applied to the plate fins without any problem.
[0009]
According to a second aspect of the present invention, in the heat exchanger of the first aspect, the flat tube and the cover material are both made of an aluminum alloy, and the cover material is made of an alloy material that is lower in potential than the alloy material of the flat tube. It has a certain configuration. In this case, when brazing in the furnace, the components of the cover material, which is more corrosive than the flat tube, diffuses to the surface of the flat tube of a similar material, and this functions as a sacrificial anticorrosive material. The durability will be further improved.
[0010]
According to a third aspect of the present invention, in the heat exchanger according to the first or second aspect, the cover member has a groove portion for fitting a peripheral edge of the plate fin on the outer peripheral surface thereof. In this configuration, when assembling the core portion, the notch portion of each plate fin is fitted into the groove portion of the cover material, so that the plate fins can be easily positioned and accurately arranged, and in the fitted state, As a result, the joint strength of the entire core portion is greatly improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the heat exchanger according to the present invention will be specifically described below with reference to the drawings. FIGS. 1A and 1B show the first embodiment, FIGS. 2A and 2B show the second embodiment, and FIGS. 3A to 3C show the third embodiment. In these embodiments, the same reference numerals are given to the portions common to the heat exchanger shown in FIGS.
[0012]
1 (a) and 1 (b) showing the first embodiment, (1) is a strip-like plate fin, and (3) is divided into a plurality of channels (30) in the width direction by partition walls (3a). A flat tube (6A) made of an extruded mold material divided into sections is a cover material made of a brazing sheet that is bent in a substantially U shape in a side view. Although these are all made of an aluminum alloy, the alloy material of the cover material (6A) is set to a material that is lower in potential than the alloy material of the flat tube by adding elements such as Zn, Sn, and In.
[0013]
As shown in FIG. 4 (a), the plate fins (1) are arranged at predetermined intervals in the left-right direction with the longitudinal direction being vertical in the core portion (10) of the heat exchanger, Notches (2), which are recessed in the width direction from the one end thereof, are formed at regular intervals in the longitudinal direction, and ridges (1a) along the longitudinal direction are provided on the surface by louvering. . Thus, each notch (2) has a length larger than the width of the flat tube (3) and the vertical width substantially matches the thickness of the flat tube (3) covered with the cover material (6A). It is set to be.
[0014]
The cover material (6A) is slightly shorter in U-shaped bent state than the width of the flat tube (3), and the inner opening width of the U-shape is substantially equal to the thickness of the flat tube (3). Is set.
[0015]
Assembling of the core portion (10) of the heat exchanger (see FIG. 4 (a)) is performed between the notches (2) at the longitudinal positions of the plate fins (1) arranged at predetermined intervals. After the flat tube (3) is fitted, the cover material (6A) is fitted so as to enter the gap between the fitting portions, or each flat tube (3) is covered with the cover material (6A) in advance. As shown in FIG. 1 (b), the two parts (3) and (6A) are fitted over the notches (2). Then, as shown in FIG. 4 (a), the entire heat exchanger including the headers (4A) (4B) and the outlets (5A) (5B) is assembled and brazed in the furnace, Are joined and integrated.
[0016]
When the brazing in the furnace is performed, the brazing material of the cover material (6A) is melted so that the plate fins (1) and the flat tubes (3) are firmly connected via the cover material (6A). At the same time, the components of the cover material (6A) diffuse to the surface of the flat tube (3).
[0017]
Therefore, in the heat exchanger to be obtained, in addition to the fact that the water droplets of the dew condensation water are easy to be transferred due to the form in which both side portions in the width direction of each plate fin (1) are extended forward and backward than the flat tube (3). The flat tube (3) is covered with the cover material (6A) from the one end of the flat tube, and the component of the cover material (6A) diffused on the surface of the flat tube (3) is a sacrificial anticorrosive material. Therefore, the flat tube (3) is extremely resistant to corrosion deterioration caused by condensed water. In addition, since the plate fin (1) does not include a brazing material, the thickness of the plate fin (1) does not decrease during brazing, and sufficient fin strength can be secured. On the other hand, the louver processing can be performed without any trouble when the plate fin (1) is manufactured.
[0018]
In the second embodiment shown in FIGS. 2 (a) and 2 (b), the plate fin (1) and the flat tube (3) are the same as in the first embodiment, but the cover material (6B) is a U-shaped curve. The width in the state is set so as to substantially coincide with the length of the notch (2) of the plate fin (1). Thus, the assembly of the core portion (10) of the heat exchanger [see FIG. 4 (a)] is performed by notching the plate fins (1) arranged at predetermined intervals between the notches (2). First, the cover material (6B) is fitted with the U-shaped bent side as the back side, and the flat tube (3) is inserted inside the fitted cover material (6B), or each cover When the flat tube (3) is fitted in the material (6B) in advance, the cover material (6B) is fitted to the notch (2). The assembled state shown in (b) may be used. Subsequent brazing in the furnace is the same as in the first embodiment.
[0019]
The heat exchanger of the second embodiment is used in an installed state in which the air flow is in the direction indicated by the arrow a in FIG. In this case, since the cover material (6B) has the entire width of the notch (2) of the plate fin (1), the water droplets of condensed water will travel down one side protruding from the cover material (6B). However, the flat tube (3) is entirely covered with the cover material (6B), and the component of the cover material (6B) diffused on the surface of the flat tube (3) functions as a sacrificial anticorrosive material. Thus, like the first embodiment, the flat tube (3) exhibits extremely high durability with little corrosion deterioration.
[0020]
In the third embodiment, instead of the cover material (6A) in the first embodiment, the cover material (6C) shown in FIG. 3 (a) is replaced with the cover material (6B) in the second embodiment. The cover material (6D) shown in 3 (b) is used. These cover materials (6C) and (6D) are similar in size and shape to the cover material (6A) or (6B), but on the outer peripheral surface, a large number of grooves (60) along the width direction are plate fins. (1) are provided at intervals corresponding to the array interval.
[0021]
Therefore, when assembling the core portion (10) of the heat exchanger (see FIG. 4 (a)), the notch portion (2) of each plate fin (1) is formed into the groove portion (60) of the cover material (6C) (6D). By fitting, the plate fins (1) can be easily positioned and accurately arranged. The obtained heat exchanger is in a state where the plate fin (1) and the cover material (6C)... Or (6D). Bond strength is greatly improved.
[0022]
In addition, although the heat exchanger of said 1st-3rd Example is a type which a pair of header (4B) (4B) has arrange | positioned on both sides of a core part (10) as shown in FIG. The present invention can be similarly applied to a heat exchanger using a serpentine serpentine tube which has no header (4B) (4B) and is bent into a shape in which a single flat tube is folded back at a predetermined length. That is, in this latter heat exchanger, the flat tubes (3) shown in FIGS. 1 to 3 correspond to upper and lower multi-stage straight portions by folding the sir painter tube.
[0023]
【The invention's effect】
According to the invention of claim 1, the corrosion resistance and durability of the flat tube as a heat exchanger that constitutes the core portion by the plate fins arranged in the horizontal direction in the vertical state and the flat tubes arranged in the upper and lower stages in the horizontal state. In addition, the plate fin and the flat tube can be reliably joined and integrated by brazing in the furnace, the strength of the plate fin can be secured, and the louver processing is not hindered.
[0024]
According to invention of Claim 2, what is excellent by the corrosion resistance and durability of a flat tube is provided as said heat exchanger.
[0025]
According to the third aspect of the present invention, there is provided the above heat exchanger that is easy to assemble the core part and excellent in the joining strength of the entire core part.
[Brief description of the drawings]
1A and 1B show a first embodiment of a heat exchanger according to the present invention, in which FIG. 1A is a perspective view of components of a core part before assembly, and FIG. 1B is a longitudinal section of a main part of the core part after assembly. It is a side view.
FIG. 2 shows the second embodiment, wherein (a) is a perspective view of components of the core part before assembly, and (b) is a longitudinal side view of the main part of the core part after assembly.
3A and 3B are perspective views of a cover material, and FIG. 3C is a longitudinal front view of a main part of a core part after assembly.
FIG. 4 shows a configuration example of a heat exchanger using a plate fin and a flat tube in the core part, (A) is a perspective view of the entire heat exchanger, and (B) is a longitudinal side view of the main part in the core part. It is.
FIG. 5 is a front view showing an example of a conventional heat exchanger using corrugated fins in the core portion.
6A and 6B show the state of water droplet adhesion on the core using corrugated fins. FIG. 6A is an enlarged front view of the main part when the flat tube is horizontal, and FIG. 6B is the case where the flat tube is vertical. It is an enlarged front view of the principal part.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Plate fin 2 ... Notch 3 ... Flat tube 6A-6D ... Cover material 10 ... Core part

Claims (6)

垂直状態で左右方向に所定間隔置きに配列した多数枚のプレートフィンと、これらプレートフィンの一側端より幅方向に凹入する切欠部に水平状態で嵌入して上下多段に配置した偏平チューブとでコア部が構成され、このコア部の偏平チューブ内を流れる熱交換媒体と外部の空気との間で熱交換を行う熱交換器において、
前記偏平チューブが、その一側端から上下面主要部を覆う側面視略U字形のブレジングシート製のカバー材を介して、前記プレートフィンの切欠部に嵌入されて当該プレートフィンと接合一体化され、各プレートフィンの幅方向両側部が偏平チューブよりも前後に張出した形態に構成されると共に、
前記偏平チューブ及びカバー材が共にアルミニウム系合金からなり、且つカバー材が偏平チューブの合金材料よりも電位的に卑な合金材料で形成されてなることを特徴とする熱交換器。
A plurality of plate fins arranged at predetermined intervals in the left-right direction in a vertical state, and flat tubes that are horizontally inserted into notches that are recessed in the width direction from one side end of these plate fins and arranged in multiple upper and lower stages. In the heat exchanger that performs the heat exchange between the heat exchange medium that flows through the inside of the flat tube of the core portion and the external air.
The flat tube is fitted and integrated with the plate fin through a notched part of the plate fin through a cover material made of a brazing sheet having a substantially U-shape in side view covering the upper and lower main parts from one end of the flat tube. Are configured in a form in which both side portions of each plate fin in the width direction are projected forward and backward than the flat tube,
The flat tube and the cover material are both made of an aluminum alloy, and the cover material is made of an alloy material that is lower in potential than the alloy material of the flat tube .
前記カバー材の外周面に、前記プレートフィンの周縁を嵌合させる溝部を有してなる請求項1に記載の熱交換器。2. The heat exchanger according to claim 1, wherein the cover member has a groove portion for fitting a peripheral edge of the plate fin on the outer peripheral surface of the cover material. 前記カバー材は、U字形の曲成状態での幅が偏平チューブの幅よりも若干短かく設定されている請求項1または2に記載の熱交換器。The heat exchanger according to claim 1 or 2, wherein the cover material is set to have a width in a U-shaped bent state slightly shorter than a width of the flat tube. 前記カバー材は、U字形の曲成状態での幅がプレートフィンの前記切欠部の長さと略一致するように設定されている請求項1または2に記載の熱交換器。The heat exchanger according to claim 1 or 2, wherein the cover member is set so that a width in a U-shaped bent state substantially matches a length of the notch portion of the plate fin. 請求項1〜4のいずれか1項に記載の熱交換器を備えた冷暖房機。The air conditioning machine provided with the heat exchanger of any one of Claims 1-4. 請求項1〜4のいずれか1項に記載の熱交換器を備えた冷凍機。The refrigerator provided with the heat exchanger of any one of Claims 1-4.
JP3827399A 1999-02-17 1999-02-17 Heat exchanger Expired - Fee Related JP4105320B2 (en)

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