JP2004270959A

JP2004270959A - Heat exchanger

Info

Publication number: JP2004270959A
Application number: JP2003058167A
Authority: JP
Inventors: Shoichi Yokoyama; 昭一横山; Shigeto Yamaguchi; 成人山口; Takashi Sugio; 孝杉尾
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2003-03-05
Filing date: 2003-03-05
Publication date: 2004-09-30

Abstract

<P>PROBLEM TO BE SOLVED: To improve heat exchange performance, ensure water draining property of condensed water, and suppress abrupt reduction of performance due to frosting. <P>SOLUTION: This heat exchanger has a plurality of flat tubes arranged in parallel to each other at a predetermined pitch, an upper side header communicating and connecting one ends of the plurality of flat tubes, a lower side header communicating and connecting the other ends of the plurality of flat tubes, and a colgate fin which is arranged between adjacent flat tubes, joins a part close to the flat tube with the flat tube or brings it into close adhesion with the flat tube, and lets air pass through a clearance. The colgate fin is provided with a plurality of crest parts and valley parts in which ridge lines extend in the direction of substantially right angle to the direction of circulation of air alternately in the direction of circulation of air, and a cut-in part is provided on the ridge line in the valley part. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、特に冷暖房兼用の空気調和機の室外機に用いられる熱交換器で、特に偏平チューブおよび隣接する偏平チューブ間にコルゲートフィンを有する熱交換器に関するものである。
【０００２】
【従来の技術】
従来のこの種のタイプの熱交換器は、図５〜８に示す一般に用いられる基本構成の熱交換器のように、長手方向を鉛直方向にして、所定のピッチで互いに平行に配置された多数の偏平チューブ１と、これらチューブ１の上端を連通接続する水平方向の上側ヘッダー１０と、前記偏平チューブ１の下端を連通接続する水平方向の下側ヘッダー１１と、隣接する前記偏平チューブ１の間に配置され、偏平チューブ１とろう付けや接着などにより接合あるいは密着され、頂部２１と中間壁部２２とが交互繰返し状態に折り曲げ成形され、その間隙を空気が通過するコルゲートフィン２を備える熱交換器において、前記コルゲートフィン２の頂部２１を平坦状に形成し、フィン角度θ１、平坦状頂部２１の長さＬ１、ルーバー長さＬ２、ルーバー角度θ２、ルーバーピッチＬ３をそれぞれ所定数値範囲に規定することにより、熱伝達率の大幅な低下を招来することなく、蒸発器として使用したときの水切れ性を向上させることを狙っている（例えば、特許文献１参照）。
【０００３】
しかし、この熱交換器が冷暖房兼用の空気調和機の室外機に用いられ、空気調和機が暖房運転され、外気温度が低くなって、コルゲートフィン２の表面温度が氷点下になるとき、空気中の水分がコルゲートフィン２に霜となって付着し、次第にこの着霜が進行し、霜が厚くなり、やがて着霜により空気の通風路が塞がれる。この間に熱交換器の通風抵抗が増大し、風量が低下し、蒸発性能が低下し、空調機の暖房性能が低下していく。特に、コルゲートフィン２には高性能化のためルーバー３が設けられているが、このルーバー３の前縁部は、局所熱伝達率が高いため、着霜の進行が早く、またルーバー３が設けられているため、コルゲートフィン２の各段の実質的間隔が狭く、着霜による通風路の閉塞が極めて早く、暖房能力の低下が極端に早いという課題があった。
【０００４】
そこで、コルゲートフィンの通風上流端部をルーバーのないものとしたり、偏平チューブの端よりも風上側へ突き出させた上、偏平チューブを１つおきに仕切り板に置き換えたり、ルーバーの形状を風上から風下に向かって順次変える熱交換器が開示されている（例えば、特許文献２参照）。
【０００５】
また、コルゲートフィンの風上側部分に小さい角度のルーバーを形成し、風下側部分に風上側部分より大きい角度のルーバーを形成したり、コルゲートフィンの風上側部分のルーバーをなくした熱交換器が開示されている（例えば、特許文献３参照）。
【０００６】
また、コルゲートフィンに角度が大きいルーバー部および平坦部あるいは凹凸部あるいは角度が小さいルーバー部を設け、角度が大きいルーバー部と平坦部あるいは凹凸部あるいは角度が小さいルーバー部の位置を、気体流路を挟んで隣接するコルゲートフィン同士で互い違いに配した熱交換器が開示されている（例えば、特許文献４参照）。
【０００７】
【特許文献１】
特開平６−２４１６７８号公報（第２〜５頁、第１〜４図）
【特許文献２】
特開平６−１４７７８５号公報（第２〜５頁、第１〜６図）
【特許文献３】
特開平６−２２１７８７号公報（第２〜４頁、第１〜７図）
【特許文献４】
特許第３０６８７６１号公報（第１〜５頁、第１〜６図）
【０００８】
【発明が解決しようとする課題】
しかしながら、上記従来の構成では、いずれにしてもコルゲートフィン２のどこかに高性能化のためのルーバーが設けられているために、着霜による通風路の閉塞を大幅に遅らせることはできず、低外気温時の空気調和機の暖房性能の急激な低下を抑制することもある程度しかできないという課題を有していた。
【０００９】
本発明はこのような従来の課題を解決するものであり、凝縮性能および蒸発性能のいずれについても大きく向上させるとともに、さらに蒸発器として用いた場合に、流通空気との熱交換によりフィン表面に生じる凝縮水を良好に流下させるとともに、冷暖房兼用の空気調和機の室外機の熱交換器として用い、空気調和機の暖房運転中、外気温が低下したときのようにフィン表面に着霜していくとき、霜の成長により急激に空気流路が閉塞されて性能が著しく低下するのを抑制する効果を奉する熱交換器を提供することを目的とする。
【００１０】
【課題を解決するための手段】
上記課題を解決するために本発明の熱交換器は、コルゲートフィンに稜線が空気の流通方向に直角方向に伸びる多数の山部と谷部を空気の流通方向に交互に設け、少なくとも前記谷部の稜線に切り込みを設けたものである。
【００１１】
上記の構成によって、熱交換器に流入した空気は、空気の流通方向に交互に設けられた稜線が空気の流通方向に直角方向に伸びる多数の山部と谷部の起伏に沿って流れ、温度境界層の剥離と再付着を繰り返すことにより伝熱性能が向上するので、本発明の熱交換器を凝縮器、蒸発器のいずれとして用いた場合でも熱交換能力を大幅に増大させる効果が得られるものである。また、蒸発器として用いた場合、流通空気との熱交換によりフィン表面に生じる凝縮水は、少なくとも前記谷部の稜線に設けた切り込みを通り抜けながらコルゲートフィンを流下していくので、優れた水捌け性が得られる。さらに、本発明の熱交換器を冷暖房兼用の空気調和機の室外機に用い、空気調和機の暖房運転中、外気温が低下したときフィン表面に着霜していくが、伝熱性能向上のためコルゲートフィンに設けた山部と谷部の交互繰返しによる起伏形状は、ルーバーや切り起こしのように隣接コルゲートフィンとの間隔を大幅に近付けるものではないので、霜の付着、成長により急激に空気流路が閉塞されていくことがなく、性能が急速に著しく低下するのを抑制する効果が得られるものである。
【００１２】
【発明の実施の形態】
以下本発明の実施の形態について図面を参照して説明する。なお、本発明の熱交換器の基本構成は、従来の技術で説明した図５、６に示す一般的な熱交換器と同様、長手方向を鉛直方向にして、所定のピッチで互いに平行に配置された多数の偏平チューブ１と、これらチューブ１の上端を連通接続する水平方向の上側ヘッダー１０と、前記偏平チューブ１の下端を連通接続する水平方向の下側ヘッダー１１と、隣接する前記偏平チューブ１の間に配置され、偏平チューブ１とろう付けや接着などにより接合あるいは密着され、繰返し折り曲げ成形され、その間隙を空気が通過するコルゲートフィン２を備えるものであるが、そのコルゲートフィンの表面形状に特徴があるので、コルゲートフィンの表面形状について詳しく説明する。
【００１３】
（実施の形態１）
実施の形態１を、図１と図２を用いて説明する。図１は本発明の第１の実施形態を示す熱交換器の要部拡大斜視図である。図１において、鉛直方向の偏平チューブ１のコルゲートフィン２の表面には、コルゲートフィン２の空気通過方向の拡大断面図（図２）にも示すように、空気の流通方向に直角方向に伸びる稜線を有する山部２０１と空気の流通方向に直角方向に伸びる稜線に切り込み２０３を有する谷部２０２が空気の流通方向に交互に多数設けられている。
【００１４】
上記の構成において、熱交換器に流入した空気は、空気の流通方向に交互に設けられた稜線が空気の流通方向に直角方向に伸びる多数の山部２０１と谷部２０２の起伏に沿って流れ、温度境界層の剥離と再付着を繰り返すので伝熱性能を向上させ、本実施形態の熱交換器を凝縮器、蒸発器のいずれとして用いた場合でも熱交換能力を大幅に増大させる効果が得られるものである。
【００１５】
また、本実施形態の熱交換器を蒸発器として用いた場合、流通空気との熱交換によりフィン表面に生じる凝縮水は、谷部２０２の稜線に設けた切り込み２０３を通り抜けながらコルゲートフィン２を流下していくので、優れた水捌け性が得られる。
【００１６】
さらに、本実施形態の熱交換器を冷暖房兼用の空気調和機の室外機に用い、空気調和機の暖房運転中、外気温が低下したとき、コルゲートフィン２の表面に着霜が進行していくが、伝熱性能向上のためコルゲートフィン２に設けた多数の山部２０１と谷部２０２の交互繰返しによる起伏形状は、従来の熱交換器のルーバーのように、隣接コルゲートフィンとの間隔を大幅に近付けるものではなく、また、局所熱伝達率が高いルーバーの前縁部に着霜が集中して進行するということがないので、霜の付着、成長により急激に空気流路が閉塞されていくことがなく、性能が急速に著しく低下するのを抑制する効果が得られるものである。
【００１７】
（実施の形態２）
実施の形態２を、図３と図４を用いて説明する。図３は本発明の第２の実施形態を示す熱交換器の要部拡大斜視図である。図３において、鉛直方向の偏平チューブ１のコルゲートフィン２の表面には、コルゲートフィン２の空気通過方向の拡大断面図（図４）にも示すように、空気の流通方向に直角方向に伸びる稜線に切り込み３０３を有する山部３０１と空気の流通方向に直角方向に伸びる稜線に切り込み３０４を有する谷部３０２が空気の流通方向に交互に多数設けられている。
【００１８】
上記の構成において、熱交換器に流入した空気は、空気の流通方向に交互に設けられた稜線が空気の流通方向に直角方向に伸びる多数の山部３０１と谷部３０２の起伏に沿って流れ、温度境界層の剥離と再付着を繰り返すので伝熱性能を向上させ、本実施形態の熱交換器を凝縮器、蒸発器のいずれとして用いた場合でも熱交換能力を大幅に増大させる効果が得られるものである。
【００１９】
また、本実施形態の熱交換器を蒸発器として用いた場合、流通空気との熱交換によりフィン表面に生じる凝縮水は、谷部３０２の稜線に設けた切り込み３０４を通り抜けながらコルゲートフィン２を流下していくので、優れた水捌け性が得られる。
【００２０】
さらに、本実施形態の熱交換器を冷暖房兼用の空気調和機の室外機に用い、空気調和機の暖房運転中、外気温が低下したとき、コルゲートフィン２の表面に着霜が進行していくが、伝熱性能向上のためコルゲートフィン２に設けた多数の山部３０１と谷部３０２の交互繰返しによる起伏形状は、従来の熱交換器のルーバーのように、隣接コルゲートフィンとの間隔を大幅に近付けるものではなく、また、局所熱伝達率が高いルーバーの前縁部に着霜が集中して進行するということがないので、霜の付着、成長により急激に空気流路が閉塞されていくことがなく、性能が急速に著しく低下するのを抑制する効果が得られるものである。また、山部３０１の稜線にも切り込み３０３を設けているので、熱交換器を組み立てるとき、コルゲートフィン２の上下方向はどちらでもよく、作業性が良好である。
【００２１】
【発明の効果】
上記から明らかなように、本発明の熱交換器は、コルゲートフィンに稜線が空気の流通方向に直角方向に伸びる多数の山部と谷部を空気の流通方向に交互に設け、少なくとも前記谷部の稜線に切り込みを設けたもので、この構成によれば、熱交換器に流入した空気は、空気の流通方向に交互に設けられた稜線が空気の流通方向に直角方向に伸びる多数の山部と谷部の起伏に沿って流れ、温度境界層の剥離と再付着を繰り返すことにより伝熱性能が向上するので、本発明の熱交換器を凝縮器、蒸発器のいずれとして用いた場合でも熱交換能力を大幅に増大させる効果が得られるものである。また、蒸発器として用いた場合、流通空気との熱交換によりフィン表面に生じる凝縮水は、少なくとも前記谷部の稜線に設けた切り込みを通り抜けながらコルゲートフィンを流下していくので、優れた水捌け性が得られる。さらに、本発明の熱交換器を冷暖房兼用の空気調和機の室外機に用い、空気調和機の暖房運転中、外気温が低下したときフィン表面に着霜していくが、伝熱性能向上のためコルゲートフィンに設けた山部と谷部の交互繰返しによる起伏形状は、ルーバーや切り起こしのように隣接コルゲートフィンとの間隔を大幅に近付けるものではないので、霜の付着、成長により急激に空気流路が閉塞されていくことがなく、性能が急速に著しく低下するのを抑制する効果が得られるものである。
【図面の簡単な説明】
【図１】本発明の第１の実施形態を示す熱交換器のコルゲートフィンの要部斜視図
【図２】図１におけるＡＡ拡大断面図
【図３】本発明の第２の実施形態を示す熱交換器のコルゲートフィンの要部斜視図
【図４】図３におけるＢＢ拡大断面図
【図５】従来の熱交換器の基本構成を示す斜視図
【図６】同上熱交換器の要部拡大斜視図
【図７】従来の熱交換器のコルゲートフィンの拡大正面図
【図８】従来の熱交換器のコルゲートフィンの空気通過方向の拡大断面図
【符号の説明】
１偏平チューブ
２コルゲートフィン
１０上側ヘッダー
１１下側ヘッダー
２０１、３０１山部
２０２、３０２谷部
２０３、３０３、３０４切り込み[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a heat exchanger used particularly for an outdoor unit of an air conditioner for both cooling and heating, and more particularly to a heat exchanger having a flat tube and a corrugated fin between adjacent flat tubes.
[0002]
[Prior art]
Conventional heat exchangers of this type include a large number of heat exchangers arranged in parallel at a predetermined pitch with a longitudinal direction being vertical, like a heat exchanger having a basic configuration generally used as shown in FIGS. Between the flat tubes 1, a horizontal upper header 10 that connects the upper ends of these tubes 1 in communication, a horizontal lower header 11 that connects the lower ends of the flat tubes 1 in communication, and the adjacent flat tubes 1. And the flat tube 1 is joined or adhered to the flat tube 1 by brazing, bonding, or the like, and the top portion 21 and the intermediate wall portion 22 are bent and formed alternately and repeatedly, and the corrugated fins 2 through which air passes through the gap are provided. The top 21 of the corrugated fin 2 is formed in a flat shape, and the fin angle θ1, the length L1 of the flat top 21, the louver length L2, the louver angle θ 2. By specifying the louver pitch L3 within a predetermined numerical range, the aim is to improve the drainage property when used as an evaporator without causing a significant decrease in heat transfer coefficient (for example, see Patent Reference 1).
[0003]
However, when this heat exchanger is used as an outdoor unit of an air conditioner that is also used for cooling and heating, and the air conditioner is operated for heating, the outside air temperature decreases, and the surface temperature of the corrugated fins 2 falls below freezing, Moisture adheres to the corrugated fins 2 as frost, and this frost gradually progresses, the frost becomes thicker, and the air passage is blocked by the frost. During this time, the ventilation resistance of the heat exchanger increases, the air volume decreases, the evaporation performance decreases, and the heating performance of the air conditioner decreases. In particular, the louver 3 is provided on the corrugated fin 2 for high performance. However, the front edge of the louver 3 has a high local heat transfer coefficient, so that the progress of frosting is fast and the louver 3 is provided. As a result, there is a problem that the substantial interval between the steps of the corrugated fin 2 is narrow, the ventilation passage is blocked very quickly due to frost, and the heating capacity decreases extremely quickly.
[0004]
Therefore, the ventilation upstream end of the corrugated fin does not have a louver, or it protrudes to the windward side from the end of the flat tube, and every other flat tube is replaced with a partition plate, or the shape of the louver is changed to the windward. There is disclosed a heat exchanger that changes sequentially from lee to lee (for example, see Patent Document 2).
[0005]
Also disclosed is a heat exchanger in which a louver having a small angle is formed in the leeward portion of the corrugated fin, a louver having an angle larger than the leeward portion is formed in the leeward portion, and the louver in the leeward portion of the corrugated fin is eliminated. (For example, see Patent Document 3).
[0006]
In addition, a corrugated fin is provided with a louver portion having a large angle and a flat portion or an uneven portion or a louver portion having a small angle, and the position of the louver portion having a large angle and the flat portion or the uneven portion or a louver portion having a small angle is defined as a gas flow path. There is disclosed a heat exchanger in which corrugated fins adjacent to each other are alternately arranged (see, for example, Patent Document 4).
[0007]
[Patent Document 1]
JP-A-6-241678 (pages 2 to 5, FIGS. 1 to 4)
[Patent Document 2]
JP-A-6-147785 (pages 2 to 5, FIGS. 1 to 6)
[Patent Document 3]
JP-A-6-221787 (pages 2 to 4, FIGS. 1 to 7)
[Patent Document 4]
Japanese Patent No. 3068761 (pages 1 to 5, FIGS. 1 to 6)
[0008]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, since the louver for improving the performance is provided somewhere in the corrugated fin 2, it is not possible to significantly delay the blockage of the ventilation path due to frost. There was a problem that it was only possible to suppress a rapid decrease in the heating performance of the air conditioner at a low outside temperature.
[0009]
The present invention solves such a conventional problem, and greatly improves both the condensation performance and the evaporation performance, and furthermore, when used as an evaporator, generates heat on the fin surface due to heat exchange with flowing air. It allows condensed water to flow down well and is used as a heat exchanger for an outdoor unit of an air conditioner that also serves as a cooling and heating unit.During the heating operation of the air conditioner, frost forms on the fin surface as if the outside air temperature had dropped. It is an object of the present invention to provide a heat exchanger that has an effect of suppressing a sharp decrease in performance due to a rapid blockage of an air flow channel due to frost growth.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the heat exchanger of the present invention is provided with a number of peaks and valleys whose corrugated fins extend in a direction perpendicular to the direction of air flow alternately in the direction of air flow, at least the valleys. Is provided with a cut in the ridge line.
[0011]
With the above configuration, the air flowing into the heat exchanger flows along the undulations of a number of peaks and valleys in which ridges provided alternately in the direction of air flow extend in a direction perpendicular to the direction of air flow. Since the heat transfer performance is improved by repeating the separation and reattachment of the boundary layer, the effect of greatly increasing the heat exchange capacity can be obtained even when the heat exchanger of the present invention is used as a condenser or an evaporator. Things. In addition, when used as an evaporator, condensed water generated on the fin surface by heat exchange with flowing air flows down the corrugated fins at least through the cuts provided at the ridges of the valleys, so that excellent drainage performance is achieved. Is obtained. Further, the heat exchanger of the present invention is used as an outdoor unit of an air conditioner that is also used for cooling and heating, and during the heating operation of the air conditioner, frost forms on the fin surface when the outside air temperature decreases, but the heat transfer performance is improved. Therefore, the corrugated fin's undulating shape by alternately repeating peaks and valleys does not make the interval between adjacent corrugated fins much like louvers and cut-and-raise, so that frost adheres and grows rapidly due to growth. The flow path is not blocked, and the effect of suppressing a rapid and remarkable decrease in performance can be obtained.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The basic structure of the heat exchanger of the present invention is similar to the general heat exchangers shown in FIGS. 5 and 6 described in the related art, with the longitudinal direction being vertical and being arranged parallel to each other at a predetermined pitch. A plurality of flat tubes 1, a horizontal upper header 10 that connects the upper ends of these tubes 1 in communication, a horizontal lower header 11 that connects the lower ends of the flat tubes 1 in communication, and the adjacent flat tubes 1 and is provided with a corrugated fin 2 which is joined or adhered to the flat tube 1 by brazing or bonding, is repeatedly bent and formed, and has air passing through the gap. Therefore, the surface shape of the corrugated fin will be described in detail.
[0013]
(Embodiment 1)
Embodiment 1 will be described with reference to FIG. 1 and FIG. FIG. 1 is an enlarged perspective view of a main part of a heat exchanger according to a first embodiment of the present invention. In FIG. 1, the surface of the corrugated fin 2 of the vertical flat tube 1 has a ridge line extending in a direction perpendicular to the air flow direction as shown in an enlarged sectional view of the corrugated fin 2 in the air passage direction (FIG. 2). And a plurality of valleys 202 having cuts 203 at ridges extending in a direction perpendicular to the air flow direction are provided alternately in the air flow direction.
[0014]
In the above configuration, the air flowing into the heat exchanger flows along the undulations of a number of peaks 201 and valleys 202 in which ridges provided alternately in the direction of air flow extend in a direction perpendicular to the direction of air flow. The heat transfer performance is improved by repeating the separation and reattachment of the temperature boundary layer, and the effect of greatly increasing the heat exchange capacity is obtained when the heat exchanger of the present embodiment is used as either a condenser or an evaporator. It is something that can be done.
[0015]
When the heat exchanger of the present embodiment is used as an evaporator, condensed water generated on the fin surface due to heat exchange with the flowing air flows down the corrugated fin 2 while passing through the notch 203 provided on the ridgeline of the valley 202. As a result, excellent drainage properties can be obtained.
[0016]
Furthermore, the heat exchanger of the present embodiment is used as an outdoor unit of an air conditioner that is also used for cooling and heating. During the heating operation of the air conditioner, when the outside air temperature decreases, frost formation on the surface of the corrugated fin 2 proceeds. However, the undulating shape of the corrugated fins 2 provided in the corrugated fins 2 to improve the heat transfer performance due to the repeated repetition of the ridges 201 and the valleys 202 greatly increases the distance between the adjacent corrugated fins, like the louver of the conventional heat exchanger. The frost does not concentrate on the front edge of the louver, which has a high local heat transfer coefficient, and the air flow path is rapidly blocked due to frost adhesion and growth. Thus, the effect of suppressing a rapid and remarkable decrease in performance can be obtained.
[0017]
(Embodiment 2)
Embodiment 2 will be described with reference to FIG. 3 and FIG. FIG. 3 is an enlarged perspective view of a main part of a heat exchanger according to a second embodiment of the present invention. In FIG. 3, as shown in an enlarged sectional view of the corrugated fin 2 in the air passage direction (FIG. 4), a ridge line extending in a direction perpendicular to the air flow direction is provided on the surface of the corrugated fin 2 of the flat tube 1 in the vertical direction. A plurality of peaks 301 having cuts 303 and valleys 302 having cuts 304 at ridges extending in a direction perpendicular to the direction of air flow are provided alternately in the direction of air flow.
[0018]
In the above configuration, the air flowing into the heat exchanger flows along the undulations of a number of peaks 301 and valleys 302 in which ridges provided alternately in the direction of air flow extend in a direction perpendicular to the direction of air flow. The heat transfer performance is improved by repeating the separation and reattachment of the temperature boundary layer, and the effect of greatly increasing the heat exchange capacity is obtained when the heat exchanger of the present embodiment is used as either a condenser or an evaporator. It is something that can be done.
[0019]
When the heat exchanger of the present embodiment is used as an evaporator, condensed water generated on the fin surface by heat exchange with the flowing air flows down the corrugated fin 2 while passing through the notch 304 provided on the ridge line of the valley 302. As a result, excellent drainage properties can be obtained.
[0020]
Furthermore, the heat exchanger of the present embodiment is used as an outdoor unit of an air conditioner that is also used for cooling and heating. During the heating operation of the air conditioner, when the outside air temperature decreases, frost formation on the surface of the corrugated fin 2 proceeds. However, the corrugated fins 2 provided on the corrugated fins 2 to improve the heat transfer performance have an undulating shape formed by alternately repeating a plurality of peaks 301 and valleys 302, which greatly increases the distance between adjacent corrugated fins, as in the case of a conventional heat exchanger louver. The frost does not concentrate on the front edge of the louver, which has a high local heat transfer coefficient, and the air flow path is rapidly blocked due to frost adhesion and growth. Thus, the effect of suppressing a rapid and remarkable decrease in performance can be obtained. Further, since the notch 303 is also provided on the ridge line of the peak portion 301, when assembling the heat exchanger, the corrugated fin 2 may be in any vertical direction, and the workability is good.
[0021]
【The invention's effect】
As is clear from the above, the heat exchanger of the present invention is provided with a number of peaks and valleys whose corrugated fins extend in a direction perpendicular to the direction of air flow in the corrugated fins alternately in the direction of air flow, and at least the valleys. According to this configuration, the air flowing into the heat exchanger has a large number of ridges in which the ridges provided alternately in the air flow direction extend in a direction perpendicular to the air flow direction. Flow along the undulations of the valleys, and the heat transfer performance is improved by repeating the separation and re-attachment of the temperature boundary layer, so that the heat exchanger of the present invention can be used as either a condenser or an evaporator. The effect of greatly increasing the exchange capacity can be obtained. In addition, when used as an evaporator, condensed water generated on the fin surface by heat exchange with flowing air flows down the corrugated fins at least through the cuts provided at the ridges of the valleys, so that excellent drainage performance is achieved. Is obtained. Further, the heat exchanger of the present invention is used as an outdoor unit of an air conditioner that is also used for cooling and heating, and during the heating operation of the air conditioner, frost forms on the fin surface when the outside air temperature decreases, but the heat transfer performance is improved. Therefore, the corrugated fin's undulating shape formed by the alternating repetition of peaks and valleys does not significantly reduce the distance between adjacent corrugated fins like louvers and cut-and-raised parts. The flow path is not blocked, and the effect of suppressing a rapid and remarkable decrease in performance can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part of a corrugated fin of a heat exchanger showing a first embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view taken along the line AA in FIG. 1. FIG. FIG. 4 is an enlarged cross-sectional view of BB in FIG. 3 of a corrugated fin of a heat exchanger. FIG. 5 is a perspective view showing a basic configuration of a conventional heat exchanger. FIG. 7 is an enlarged front view of a corrugated fin of a conventional heat exchanger. FIG. 8 is an enlarged cross-sectional view of a corrugated fin of a conventional heat exchanger in an air passage direction.
DESCRIPTION OF SYMBOLS 1 Flat tube 2 Corrugated fin 10 Upper header 11 Lower header 201, 301 Crest 202, 302 Valley 203, 303, 304 Cut

Claims

所定のピッチで互いに平行に配置された複数の偏平チューブと、前記複数の扁平チューブの一端を連通接続する上側ヘッダーと、前記多数の扁平チューブの他端を連通接続する下側ヘッダーと、隣接する前記扁平チューブの間に配置され、前記扁平チューブと近接する部分を前記扁平チューブと接合あるいは密着し、その間隙を空気が通過するコルゲートフィンを有する熱交換器において、前記コルゲートフィンに、稜線が空気の流通方向に対し略直角方向に伸びる複数の山部と谷部を空気の流通方向に交互に設け、前記谷部の稜線に切り込みを設けた熱交換器。A plurality of flat tubes arranged in parallel with each other at a predetermined pitch, an upper header that communicates and connects one end of the plurality of flat tubes, and a lower header that communicates and connects the other ends of the many flat tubes are adjacent to each other. A heat exchanger having a corrugated fin disposed between the flat tubes and having a portion adjacent to the flat tube joined or adhered to the flat tube and having a gap passing through the air, wherein the corrugated fin has a ridge line formed of air. A heat exchanger having a plurality of peaks and valleys extending in a direction substantially perpendicular to the direction of air flow alternately provided in the direction of air flow, and ridges of the valleys provided with cuts.

所定のピッチで互いに平行に配置された複数の偏平チューブと、前記複数の扁平チューブの一端を連通接続する上側ヘッダーと、前記多数の扁平チューブの他端を連通接続する水平方向の下側ヘッダーと、隣接する前記扁平チューブの間に配置され、前記扁平チューブと近接する部分を前記扁平チューブと接合あるいは密着し、その間隙を空気が通過するコルゲートフィンを有する熱交換器において、前記コルゲートフィンに、稜線が空気の流通方向に対し略直角方向に伸びる複数の山部と谷部を空気の流通方向に交互に設け、前記山部の稜線と前記谷部の稜線の両方に切り込みを設けた熱交換器。A plurality of flat tubes arranged in parallel with each other at a predetermined pitch, an upper header that communicates and connects one end of the plurality of flat tubes, and a horizontal lower header that communicates and connects the other ends of the plurality of flat tubes. In the heat exchanger having a corrugated fin disposed between the adjacent flat tubes, a portion adjacent to the flat tube is bonded or adhered to the flat tube, and a gap passes between the corrugated fins. Heat exchange in which a plurality of peaks and valleys whose ridges extend in a direction substantially perpendicular to the direction of air flow are provided alternately in the direction of air flow, and both the ridges of the peaks and the ridges of the valleys are cut. vessel.