JP4143966B2 - Flat tube for EGR cooler - Google Patents

Flat tube for EGR cooler Download PDF

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Publication number
JP4143966B2
JP4143966B2 JP2003054550A JP2003054550A JP4143966B2 JP 4143966 B2 JP4143966 B2 JP 4143966B2 JP 2003054550 A JP2003054550 A JP 2003054550A JP 2003054550 A JP2003054550 A JP 2003054550A JP 4143966 B2 JP4143966 B2 JP 4143966B2
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turbulent flow
plate
flat
plane
flat tube
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JP2004263616A (en
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俊道 小林
敏克 八谷
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T.RAD CO., L T D.
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T.RAD CO., L T D.
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    • 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
    • F28D7/16—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 being arranged in parallel spaced relation
    • F28D7/1684—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 being arranged in parallel spaced relation the conduits having a non-circular cross-section
    • 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
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0031—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other
    • F28D9/0037—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by paired plates touching each other the conduits for the other heat-exchange medium also being formed by paired plates touching each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/12—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by creating turbulence, e.g. by stirring, by increasing the force of circulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/10—Particular pattern of flow of the heat exchange media
    • F28F2250/104—Particular pattern of flow of the heat exchange media with parallel flow

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

Description

【０００１】
【発明の属する技術分野】
本発明は、自動車等の排ガス再循環装置（ＥＧＲ）に用いる排ガス冷却用クーラであって、それを構成する多数の偏平チューブの夫々に関する。
【０００２】
【従来の技術】
偏平チューブを並列させ、それらのチューブの両端をヘッダに連通してコアを構成し、そのコアの外周にケーシングを被嵌し、ケーシング内に冷却水または冷却空気を流通させると共に、ヘッダを介して各偏平チューブ内に高温の排ガスを流通させ、その排ガスを冷却する熱交換が知られている（例えば、特許文献１参照。）。
【０００３】
このような熱交換器において、各偏平チューブの内部に断面波形に曲折したインナーフィンを挿入したものが知られている。
さらにインナーフィンとして、その平面もウェーブ形に曲折されたウェーブフィンが知られている。これは、金属板を曲折して断面波形にすると共に、その平面において波の稜線および谷線が波形に蛇行されたものである。
このように断面および平面において共に波形に曲折形成されたものは、流体の攪拌をより促進し熱交換性能が良いものとなる。
【０００４】
【特許文献１】
特開２０００−９７５７８号公報
【０００５】
【発明が解決しようとする課題】
このようなインナーフィンを有する偏平チューブは、排ガスがチューブ内を流通するとき、インナーフィンの表面に排ガスの煤が付着し、熱交換器性能を低下させると共に、煤の付着により圧力損失を上昇させていた。
これはエンジンからのＥＧＲガスの流量の変化や、その時々のガス組成の変化が生じているとき、ある条件のもとで排ガス中の煤等のデポジットがフィンに付着するものと考えられる。特に、ウェーブフィンではその平面頂部３ｂおよび平面谷部３ｃにおいて排ガスの滞留が生じ易く、そこに煤等のデポジットが付着していることが明らかとなった。
そこで本発明は、係る煤等のデポジットが付着することを防止するＥＧＲクーラ用の偏平チューブを提供することを課題とする。
【０００６】
【課題を解決するための手段】
請求項１に記載の本発明は、開口側が互いに整合する浅い溝形に形成され、その溝底が互いに対向するように嵌着されて、その嵌着部がろう付けされ、内部に偏平な流路を形成する一対の第１プレート（１）と第２プレート（２）と、
前記偏平な流路に挿入され、横断面波形に曲折形成され、その厚み方向の両端面が両プレート（１）（２）内面にろう付けされたインナーフィン（３）と、を具備し、
夫々のプレート（１）（２）には、その幅方向に沿って内面側に凹陥または突出する乱流形成部（４）が設けられ、多数のその乱流形成部（４）が長手方向に互いに離間して並列され、
前記インナーフィン（３）は、その波の夫々の稜線（３ａ）が平面波形に曲折し、その平面波形の平面頂部（３ｂ）および平面谷部（３ｃ）の位置で、前記乱流形成部（４）が夫々のプレート（１）（２）に配置されたＥＧＲクーラ用の偏平チューブである。
【０００７】
請求項２に記載の本発明は、請求項１において、
両プレート(1)(2)内面の前記乱流形成部(4) が、平面小円形に凹陥または突出するＥＧＲクーラ用の偏平チューブである。
【０００８】
請求項３に記載の本発明は、請求項１において、
前記乱流形成部(4) が両プレート(1)(2)内面に幅方向に形成された凹条からなるＥＧＲクーラ用の偏平チューブである。
【００１０】
【発明の実施の形態】
次に、図面に基づいて本発明の実施の形態につき説明する。
図１は本発明の偏平チューブ５の分解斜視図であり、図２はその組立て状態を示す平面図、図３は図２の III− III矢視断面における要部拡大図である。また、図４は本偏平チューブ５におけるインナーフィン３の平面波形状と、第１プレート１，第２プレート２における乱流形成部４との相対位置を示す説明図である。
この偏平チューブ５は、開口側が互いに整合する浅い溝形に形成された一対の第１プレート１と第２プレート２とを有し、その内部にインナーフィン３が挿入される。
【００１１】
インナーフィン３はこの例では、金属板を横断面波形に曲折形成すると共に、その夫々の波の稜線３ａ（谷線を含む）が平面波形に曲折したものである。そしてその全幅および全長は、第１プレート１，第２プレート２のそれに略整合する。
第１プレート１，第２プレート２の内面には、この例では図３に示す如く多数の平面小円形の内面凹部４ａが等間隔に配置されている。この内面凹部４ａの位置は、インナーフィン３の横断面ではその谷部に存在する。しかも、そのインナーフィンの平面では、内面凹部４ａは平面波形の平面頂部３ｂおよび平面谷部３ｃの位置に配置されている。
【００１２】
この実施の形態では、夫々の内面凹部４ａが本発明の第１の乱流形成部４を構成する。これは、図４においてインナーフィン３の平面における平面頂部３ｂ，平面谷部３ｃには、実験の結果、排ガス中の煤等によるデポジットがより多く付着することが明らかになっていからである。そこでその部分に乱流形成部４としての内面凹部４ａが配置され、そこの排ガスに乱流を起こして、煤の付着を防止するものである。即ち、平面頂部３ｂ，平面谷部３ｃは、それ以外の部分に比べて排ガスが滞留しがちな部分であるが、そこに乱流形成部４が配置されることによりその付着を防止できる。
【００１３】
次に、図５は本発明の偏平チューブの他の実施の形態であり、この例の乱流形成部４が図１〜図４のそれと異なる点は、図３の内面凹部４ａの代わりに図５の内面凸部４ｂが設けられたものであり、他は図１〜図４のそれと同じである。そしてこの内面凸部４ｂが、本発明の第２の乱流形成部４を構成する。即ち、インナーフィン３の横断面では、その谷部に内面凸部４ｂが夫々突出され、それらが、インナーフィンの平面では平面波形の平面頂部３ｂおよび平面谷部３ｃの位置に配置されている。そして、その部分の排ガスに絞り効果を与え、流速を増加させて排ガス中の煤等の付着を防止する。
【００１４】
次に、図６〜図８は本発明の第３の実施の形態を示し、この例は第１プレート１，第２プレート２に夫々二列の内面凹条部４ｃが多数並列されたものである。この内面凹条部４ｃの位置は、インナーフィン３の平面における波形の平面頂部３ｂおよび平面谷部３ｃの位置である。
この内面凹条部４ｃが、本発明の第３の乱流形成部４を構成する。この内面凹条部４ｃは図７から明らかなようにインナーフィン３の横断面における頂部にも谷部にも存在する。そしてこの内面凹条部４ｃ部分のみインナーフィン３の表面と分離し、他の部分が全てインナーフィン３の厚み方向両端面と第１プレート１，第２プレート２の各内面とが一体にろう付け固定されている。
このような内面凹条部４ｃであっても、そのインナーフィン３の平面頂部３ｂおよび平面谷部３ｃに配置されているため、そこで乱流が起こり、その部分に生じがちな煤等の付着を防止できる。
【００１５】
次に、図９は本発明の偏平チューブ５の第４の実施形態を示し、この例はインナーフィン３が前記第１〜第３の実施の形態と異なり、その波の稜線が平面において直線状に形成されたものである。また、第１プレート１，第２プレート２に形成された内面凹条部４ｃは、夫々の幅の略全長に渡って連続して形成され、長手方向に定間隔にそれが配置されている。
この例においても、内面凹条部４ｃが第１プレート１，第２プレート２の長手方向に定間隔に配置されているため、偏平チューブ５内を流通する排ガス11は定間隔毎に乱流が起こされ、インナーフィン３に煤等が付着することを防止できる。
【００１６】
このようにしてなる各偏平チューブ５は、図１０の如く、互いに僅かの間隔を隔てて並列され、その両端が夫々一対のチューブプレート６に液密に固定される。そして夫々のチューブプレート６にヘッダ本体７（左側を省略）の開口端が気密に接続されてコアを構成し、そのコアの外周にケーシング８が被嵌される。そしてケーシング８の長手方向両端には膨出部12が設けられ、その膨出部12に夫々入口パイプ９，出口パイプ10が連通する。そして、入口パイプ９から冷却水13が膨出部12内を流通して各偏平チューブ外面を通過し、出口パイプ10に流出する。そして一方のヘッダから排ガス11が他方のヘッダに偏平チューブ５内を流通する。このようにしてコア内で排ガス11と冷却水13とが熱交換されるものである。夫々の偏平チューブ５の外面には乱流形成部４が形成され、冷却水13自体にも乱流を起こさせ熱交換を促進する。
【００１７】
【発明の作用・効果】
本発明のＥＧＲクーラ用の偏平チューブは、その偏平チューブ５内に横断面波形に曲折形成されたインナーフィン３がろう付け接合されたものにおいて、夫々の第１プレート１，第２プレート２の内面側に凹陥または突出する乱流形成部４が設けられ、前記インナーフィン３は、その波の夫々の稜線３ａが平面波形に曲折し、その平面波形の平面頂部３ｂおよび平面谷部３ｃの位置で、前記乱流形成部４が夫々のプレート１，２に配置されている。従って、このようにインナーフィン３が平面波形に曲折したものにおいて、その平面頂部３ｂおよび平面谷部３ｃで付着しがちな排ガスの煤を効果的に下流側に流し、熱交換性能を維持する効果がある。即ち、その乱流形成部４によって内部を流通する排ガス１１の煤がインナーフィン３の表面に付着することを防止し、ＥＧＲクーラの性能を永続的に維持し得る。
また、この乱流形成部４は浅い溝形に形成された第１プレート１，第２プレート２の内面に設けられるものであるから、プレス成形により容易に量産できる構造のものであり、製造し易く安価にそれを提供できる。
【００１８】
上記構成において、乱流形成部４を平面小円形の凹陥または突出したものとすることができる。
このような乱流形成部４を多数第１プレート１，第２プレート２の内面に設けることにより、インナーフィン３の各部の排ガスの媒の付着を効果的に防止できる。
【００１９】
上記構成において、乱流形成部４を第１プレート１，第２プレート２の内面の幅方向に形成した凹条からなるものとすることができる。
このようにすることにより、その凹条の大きさをインナーフィン３の波のピッチに拘わらずより大きくして、偏平チューブ５内を流通する排ガスを周期的に乱流状態にし、排ガスの媒の付着をより効果的に防止すると共に、偏平チューブ５の外面側に流通する冷却水等の攪拌を促進して熱交換性能を向上できる。
【図面の簡単な説明】
【図１】本発明のＥＧＲクーラ用の偏平チューブの分解斜視図。
【図２】同組立て状態を示す平面図。
【図３】図２の III− III矢視断面における要部拡大図。
【図４】インナーフィン３の平面波形の平面頂部３ｂ，平面谷部３ｃと、第１プレート１，第２プレート２の乱流形成部４との相対位置関係を示す説明図。
【図５】本発明の第２の実施の形態を示す要部横断面図であって、図３に対応するもの。
【図６】本発明の第３の実施の形態を示す偏平チューブ５の平面図。
【図７】図６のVII −VII 矢視断面における要部拡大図。
【図８】インナーフィン３の平面における平面頂部３ｂおよび平面谷部３ｃと内面凹条部４ｃとの関係を示す説明図。
【図９】本発明の第４の実施の形態を示す偏平チューブ５の分解斜視図。
【図１０】本発明の偏平チューブ５を用いたＥＧＲクーラの一部破断斜視図。
【符号の説明】
１ 第１プレート
２ 第２プレート
３ インナーフィン
３ａ 稜線
３ｂ 平面頂部
３ｃ 平面谷部
４ 乱流形成部
４ａ 内面凹部
４ｂ 内面凸部
４ｃ 内面凹条部
５ 偏平チューブ
６ チューブプレート
７ ヘッダ本体
８ ケーシング
９ 入口パイプ
10 出口パイプ
11 排ガス
12 膨出部
13 冷却水[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust gas cooling cooler used for an exhaust gas recirculation device (EGR) of an automobile or the like, and relates to each of a number of flat tubes constituting the cooler.
[0002]
[Prior art]
Flat tubes are arranged in parallel, both ends of the tubes communicate with the header to form a core, a casing is fitted on the outer periphery of the core, and cooling water or cooling air is circulated in the casing, and through the header Heat exchange is known in which high-temperature exhaust gas is circulated in each flat tube and the exhaust gas is cooled (see, for example, Patent Document 1).
[0003]
In such a heat exchanger, one in which an inner fin bent in a cross-sectional waveform is inserted inside each flat tube is known.
Furthermore, as an inner fin, a wave fin whose plane is bent into a wave shape is known. In this case, the metal plate is bent to have a corrugated cross-section, and the ridges and valleys of the wave meander in the corrugation on the plane.
In this way, the one that is bent in a waveform in both the cross section and the plane further promotes the stirring of the fluid and has good heat exchange performance.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-97578
[Problems to be solved by the invention]
Such a flat tube having inner fins causes exhaust gas soot to adhere to the surface of the inner fin when the exhaust gas circulates in the tube, reducing the heat exchanger performance and increasing pressure loss due to the soot attachment. It was.
It is considered that deposits such as soot in the exhaust gas adhere to the fins under certain conditions when a change in the flow rate of EGR gas from the engine and a change in the gas composition from time to time occur. In particular, in the case of wave fins, it has become clear that exhaust gas is liable to stay in the flat top portion 3b and the flat valley portion 3c, and deposits such as soot are attached thereto.
Then, this invention makes it a subject to provide the flat tube for EGR coolers which prevents that deposits, such as a soot, adhere.
[0006]
[Means for Solving the Problems]
The present invention according to claim 1 is formed in a shallow groove shape whose opening sides are aligned with each other, the bottoms of the grooves are fitted so as to face each other, the fitting portions are brazed, and a flat flow is formed inside. A pair of first plate (1) and second plate (2) forming a path;
An inner fin (3) inserted into the flat flow path, bent into a corrugated cross-sectional shape, and brazed to the inner surfaces of both plates (1) and (2);
Each plate (1) (2) is provided with a turbulent flow forming portion (4) which is recessed or protrudes on the inner surface side along the width direction, and a number of the turbulent flow forming portions (4) are arranged in the longitudinal direction. Are parallel to each other,
Each ridgeline (3a) of the wave of the inner fin (3) bends into a plane waveform, and the turbulent flow forming section (at the position of the plane top (3b) and plane valley (3c) of the plane waveform ( 4) is an EGR cooler flat tube disposed on each of the plates (1) and (2) .
[0007]
The present invention according to claim 2 is the method according to claim 1,
The turbulent flow forming portions (4) on the inner surfaces of both plates (1) and (2) are flat tubes for an EGR cooler that are recessed or protruded into a small planar circle.
[0008]
The present invention according to claim 3 provides the method according to claim 1,
The turbulent flow forming portion (4) is a flat tube for an EGR cooler composed of a concave strip formed in the inner surface of both plates (1) and (2) in the width direction.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of the flat tube 5 of the present invention, FIG. 2 is a plan view showing the assembled state, and FIG. 3 is an enlarged view of a main part in the cross section taken along the line III-III in FIG. FIG. 4 is an explanatory diagram showing a relative position between the plane wave shape of the inner fin 3 in the flat tube 5 and the turbulent flow forming portion 4 in the first plate 1 and the second plate 2.
The flat tube 5 has a pair of a first plate 1 and a second plate 2 formed in a shallow groove shape whose openings are aligned with each other, and an inner fin 3 is inserted therein.
[0011]
In this example, the inner fin 3 is formed by bending a metal plate into a corrugated cross section, and the ridgeline 3a (including a trough line) of each wave is bent into a planar corrugation. The full width and the full length are substantially aligned with those of the first plate 1 and the second plate 2.
In this example, as shown in FIG. 3, a large number of planar small circular inner surface recesses 4a are arranged on the inner surfaces of the first plate 1 and the second plate 2 at equal intervals. The position of the inner surface concave portion 4 a exists in the valley portion in the cross section of the inner fin 3. Moreover, in the plane of the inner fin, the inner surface concave portion 4a is disposed at the position of the plane top portion 3b and the plane valley portion 3c having a plane waveform.
[0012]
In this embodiment, each inner surface concave portion 4a constitutes the first turbulent flow forming portion 4 of the present invention. This is because, as a result of the experiment, it has become clear that more deposits due to soot and the like in the exhaust gas adhere to the flat top 3b and the flat valley 3c in the plane of the inner fin 3 in FIG. Therefore, an inner surface concave portion 4a as the turbulent flow forming portion 4 is arranged in that portion, and turbulent flow is caused in the exhaust gas there to prevent soot from adhering. That is, the plane top 3b and the plane valley 3c are portions where the exhaust gas tends to stay as compared with other portions, but the turbulent flow forming portion 4 can be prevented from adhering thereto.
[0013]
Next, FIG. 5 shows another embodiment of the flat tube according to the present invention. The turbulent flow forming portion 4 of this example is different from that of FIGS. 5 is provided with the inner surface convex portion 4b, and the others are the same as those in FIGS. And this inner surface convex part 4b comprises the 2nd turbulent flow formation part 4 of this invention. That is, in the cross section of the inner fin 3, the inner surface protrusions 4b protrude from the troughs, and they are arranged at the positions of the flat top portion 3b and the flat trough portion 3c of the flat corrugation in the plane of the inner fin. Then, a throttling effect is given to the exhaust gas in that portion, and the flow velocity is increased to prevent the soot and the like from adhering in the exhaust gas.
[0014]
Next, FIGS. 6 to 8 show a third embodiment of the present invention. In this example, a plurality of inner row concave portions 4c are arranged in parallel on the first plate 1 and the second plate 2, respectively. is there. The position of the inner surface concave groove portion 4 c is the position of the corrugated flat top portion 3 b and the flat trough portion 3 c in the plane of the inner fin 3.
This inner surface concave part 4c constitutes the third turbulent flow forming part 4 of the present invention. As is apparent from FIG. 7, the inner surface recess 4 c exists at the top and the valley in the cross section of the inner fin 3. And only this inner surface concave strip 4c part is separated from the surface of the inner fin 3, and all other parts are brazed integrally with both end surfaces in the thickness direction of the inner fin 3 and the inner surfaces of the first plate 1 and the second plate 2. It is fixed.
Even such an inner surface concave strip portion 4c is disposed at the flat top portion 3b and the flat trough portion 3c of the inner fin 3, so that turbulence occurs there, and adhesion of wrinkles or the like that tend to occur in that portion occurs. Can be prevented.
[0015]
Next, FIG. 9 shows a fourth embodiment of the flat tube 5 of the present invention. In this example, the inner fin 3 is different from the first to third embodiments, and the ridgeline of the wave is linear in the plane. It is formed. Moreover, the inner surface concave strips 4c formed on the first plate 1 and the second plate 2 are formed continuously over substantially the entire length of each width, and are arranged at regular intervals in the longitudinal direction.
Also in this example, since the inner surface concave portions 4c are arranged at regular intervals in the longitudinal direction of the first plate 1 and the second plate 2, the exhaust gas 11 flowing through the flat tube 5 is turbulent at regular intervals. It is possible to prevent wrinkles and the like from adhering to the inner fin 3.
[0016]
As shown in FIG. 10, the flat tubes 5 thus formed are juxtaposed at a slight interval, and both ends thereof are fixed to the pair of tube plates 6 in a liquid-tight manner. The open end of the header body 7 (the left side is omitted) is airtightly connected to each tube plate 6 to form a core, and the casing 8 is fitted on the outer periphery of the core. Further, bulging portions 12 are provided at both ends in the longitudinal direction of the casing 8, and an inlet pipe 9 and an outlet pipe 10 communicate with the bulging portions 12, respectively. Then, the cooling water 13 flows from the inlet pipe 9 through the bulging portion 12, passes through the outer surface of each flat tube, and flows out to the outlet pipe 10. Then, the exhaust gas 11 flows from the one header to the other header in the flat tube 5. In this way, the exhaust gas 11 and the cooling water 13 are heat-exchanged in the core. A turbulent flow forming portion 4 is formed on the outer surface of each flat tube 5 to cause turbulent flow in the cooling water 13 itself and promote heat exchange.
[0017]
[Operation and effect of the invention]
The flat tube for an EGR cooler according to the present invention is formed by brazing and joining the inner fins 3 bent in a cross-sectional waveform in the flat tube 5, and the inner surfaces of the first plate 1 and the second plate 2. A turbulent flow forming portion 4 that is recessed or protruded on the side is provided, and the inner fin 3 has its ridgeline 3a bent into a plane waveform, and at the position of the plane top 3b and plane valley 3c of the plane waveform. The turbulent flow forming portion 4 is disposed on each of the plates 1 and 2. Accordingly, in the case where the inner fin 3 is bent in a plane waveform in this way, the effect of maintaining the heat exchange performance by effectively flowing the exhaust gas soot that tends to adhere at the plane top 3b and the plane valley 3c to the downstream side. There is. In other words, the due to the turbulent flow forming portion 4 is soot exhaust gas 11 flowing inside prevented from adhering to the surface of the inner fin 3 can maintain the performance of the EGR cooler permanently.
Further, since the turbulent flow forming portion 4 is provided on the inner surfaces of the first plate 1 and the second plate 2 formed in shallow groove shapes, the turbulent flow forming portion 4 has a structure that can be easily mass-produced by press molding. It can be provided easily and inexpensively.
[0018]
The said structure WHEREIN: The turbulent flow formation part 4 shall be a flat small circular recessed part or what protruded.
By providing many such turbulent flow forming portions 4 on the inner surfaces of the first plate 1 and the second plate 2, it is possible to effectively prevent the exhaust gas medium from adhering to each portion of the inner fin 3.
[0019]
The said structure WHEREIN: The turbulent flow formation part 4 shall consist of a groove formed in the width direction of the inner surface of the 1st plate 1 and the 2nd plate 2. FIG.
By doing so, the size of the recesses is made larger regardless of the wave pitch of the inner fin 3, and the exhaust gas flowing through the flat tube 5 is periodically turbulent, and the exhaust gas medium While preventing adhesion more effectively, stirring of cooling water etc. which distribute | circulates to the outer surface side of the flat tube 5 can be accelerated | stimulated, and heat exchange performance can be improved.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a flat tube for an EGR cooler according to the present invention.
FIG. 2 is a plan view showing the assembled state.
FIG. 3 is an enlarged view of a main part in a cross section taken along line III-III in FIG.
4 is an explanatory diagram showing a relative positional relationship between a planar top 3b and a planar valley 3c of a planar waveform of the inner fin 3 and a turbulent flow forming portion 4 of the first plate 1 and the second plate 2. FIG.
FIG. 5 is a cross-sectional view of an essential part showing a second embodiment of the present invention, corresponding to FIG. 3;
FIG. 6 is a plan view of a flat tube 5 showing a third embodiment of the present invention.
7 is an enlarged view of a main part in a cross section taken along the arrow VII-VII in FIG.
FIG. 8 is an explanatory diagram showing the relationship between the flat top 3b and flat valley 3c and the inner concave groove 4c in the plane of the inner fin 3;
FIG. 9 is an exploded perspective view of a flat tube 5 showing a fourth embodiment of the present invention.
FIG. 10 is a partially broken perspective view of an EGR cooler using the flat tube 5 of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st plate 2 2nd plate 3 Inner fin 3a Edge line 3b Plane top part 3c Plane trough part 4 Turbulence formation part 4a Inner surface recessed part 4b Inner surface convex part 4c Inner surface recessed part 5 Flat tube 6 Tube plate 7 Header main body 8 Casing 9 Inlet pipe
10 Outlet pipe
11 exhaust gas
12 bulge
13 Cooling water

Claims (3)

開口側が互いに整合する浅い溝形に形成され、その溝底が互いに対向するように嵌着されて、その嵌着部がろう付けされ、内部に偏平な流路を形成する一対の第１プレート（１）と第２プレート（２）と、
前記偏平な流路に挿入され、横断面波形に曲折形成され、その厚み方向の両端面が両プレート（１）（２）内面にろう付けされたインナーフィン（３）と、を具備し、
夫々のプレート（１）（２）には、その幅方向に沿って内面側に凹陥または突出する乱流形成部（４）が設けられ、多数のその乱流形成部（４）が長手方向に互いに離間して並列され、
前記インナーフィン（３）は、その波の夫々の稜線（３ａ）が平面波形に曲折し、その平面波形の平面頂部（３ｂ）および平面谷部（３ｃ）の位置で、前記乱流形成部（４）が夫々のプレート（１）（２）に配置されたＥＧＲクーラ用の偏平チューブ。A pair of first plates that are formed in shallow groove shapes whose opening sides are aligned with each other, the bottoms of the grooves are fitted to face each other, the fitting portions are brazed, and a flat flow path is formed inside 1) and the second plate (2),
An inner fin (3) inserted into the flat flow path, bent into a corrugated cross-sectional shape, and brazed to the inner surfaces of both plates (1) and (2);
Each plate (1) (2) is provided with a turbulent flow forming portion (4) which is recessed or protrudes on the inner surface side along the width direction, and a number of the turbulent flow forming portions (4) are arranged in the longitudinal direction. Are parallel to each other,
Each ridgeline (3a) of the wave of the inner fin (3) bends into a plane waveform, and the turbulent flow forming section (at the position of the plane top (3b) and plane valley (3c) of the plane waveform ( 4) is a flat tube for an EGR cooler arranged on each plate (1) (2) . 請求項１において、
両プレート（１）（２）内面の前記乱流形成部（４）が、平面小円形に凹陥または突出するＥＧＲクーラ用の偏平チューブ。In claim 1,
A flat tube for an EGR cooler in which the turbulent flow forming portions (4) on the inner surfaces of both plates (1) and (2) are recessed or protruded into a flat small circular shape. 請求項１において、
前記乱流形成部（４）が両プレート（１）（２）内面に幅方向に形成された凹条からなるＥＧＲクーラ用の偏平チューブ。In claim 1,
A flat tube for an EGR cooler in which the turbulent flow forming portion (4) is formed of a concave strip formed in the width direction on the inner surfaces of both plates (1) and (2).
JP2003054550A 2003-02-28 2003-02-28 Flat tube for EGR cooler Expired - Fee Related JP4143966B2 (en)

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