JPS5860197A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent stress corrosion crack from occurring at the groove part of a core plate by a structure wherein the height of the outer side wall of the groove part of the core plate, which is engaged with the outward side wall surface of the fitting part of the edge of a tank, and the caulked height of a caulking plate are determined in a specified relationship. CONSTITUTION:A core plate 16, whose outer periphery edge is formed in an inner and an outer side walls and the groove part 20 with a bottom wall, is fixed on the side wall of a tube 7 or on a tank main body 1 near its upper end along its periphery. The fitting part 10 of the edge of the tank 2 is fitted through an elastic sealing material 21 in the groove part 20. In this case, the height h from the bottom surface 19 of the inside of groove at the groove part 20 of the caulking plate 23 to the upper end of the outer side wall of the groove part 20 and the height H from said bottom surface 19 of the inside of groove at the groove part 20 to the outside application surface, onto which the caulking plate 23 is caulked, of the fitting part 10 of the edge of the tank 2 are set so as to satisfy the relationship of H-h>=0.5mm..

Description

【発明の詳細な説明】 本発明は、金属製本体圧合成樹脂製のタンクをかしめ作
業によって取付けた熱又換器の改良に関し、例廠ば自動
車用ラジェータに用いて好適なものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a heat exchanger in which a metal main body pressure synthetic resin tank is attached by caulking, and is suitable for use in, for example, an automobile radiator.

金属製本体にコアプレートを設け、このコアプレートの
外周縁を溝形に成形し、この溝内に、合成樹脂製タンク
の端縁に設けた、はぼ四角形断面の取付部を嵌合させ、
コアプレートの溝形部の外面に係゛合したかしめプレー
トをこの取付部にかしめることによってタンクを本体に
密封装着する形式の熱交換器は公知である。溝に嵌合し
たタンク端縁取付部の底面と溝底面との間には弾性シー
ル材が設置しであるが、この弾性シール材の直下の錦底
壁を構成しているコアプレート部分に、水質の悪い冷却
水を用いたときなどに、割れが生じ、熱又換器の寿命が
短かくなることがあった。これが応力腐食割れであるこ
とを本発明者らはつきとめた。応力腐食割れというのは
、腐食という化学的な働きと応力という物理的な働きの
相乗作用によって生じる割れのことである。A core plate is provided on the metal body, the outer peripheral edge of this core plate is formed into a groove shape, and a mounting portion with a rectangular cross section provided on the edge of a synthetic resin tank is fitted into this groove,
Heat exchangers are known in which a tank is hermetically mounted to a main body by caulking a caulking plate that engages with the outer surface of a grooved portion of a core plate to this attachment portion. An elastic sealing material is installed between the bottom surface of the tank edge attachment part that fits into the groove and the bottom surface of the groove. When poor quality cooling water was used, cracks could occur and the lifespan of the heat exchanger could be shortened. The inventors found that this was stress corrosion cracking. Stress corrosion cracking is cracking that occurs due to the synergistic effect of the chemical action of corrosion and the physical action of stress.

本発明の目的を工このよ′うな応力腐食割れを防いで前
記形式の熱交換器の寿命を延ばすことＫある。It is an object of the present invention to prevent such stress corrosion cracking and to extend the life of heat exchangers of the type described above.

以下、添付図面な参照しながらより詳しく説明する。A more detailed explanation will be given below with reference to the accompanying drawings.

第１図は本発明に係る熱変換器、たとえば自動車用ラジ
ェータを示しており、ラジェータを工銅製のコルデート
フィンＴと黄銅製のチューブ８を含む瞼゛属製の本体１
とその上、下端に密封装着した合成樹脂製のタンク２，
３とを包含する。上方のタンク２には冷却水補給口４と
冷却水流入パイプ５とが設けてあ、す、下方タンク３に
は冷却水流出パイプ６が設けであるが、基本的に上、下
のタンクは同じ構造であるから、以下、上方のタンク２
についてのみ説明する。上下を逆にして考えれば、以下
の説ＦＩＡヲ工下万タンク３にもｉ用できることは了−
解されたい。FIG. 1 shows a heat converter according to the present invention, for example, a radiator for an automobile.
and a synthetic resin tank 2 sealed at the top and bottom end.
3. The upper tank 2 is provided with a cooling water supply port 4 and a cooling water inlet pipe 5, and the lower tank 3 is provided with a cooling water outflow pipe 6, but basically the upper and lower tanks are Since they have the same structure, the upper tank 2 is shown below.
I will only explain about. If you think about it upside down, you can see that the following theory can also be applied to FIA Works Tank 3.
I want to be understood.

第２図シエタンク２を本体１に密封装着する従来方法を
示しており、タンク２は一端開放となっており、これを
コルデートフィンＴの付いたチューブ８から成る本体１
の端部にかぶせることによってタンク２が完全となる。Fig. 2 shows a conventional method of sealingly attaching the tank 2 to the main body 1, in which one end of the tank 2 is open, and this is connected to the main body 1 consisting of a tube 8 with a cordate fin T.
By covering the end of the tank 2, the tank 2 is completed.

タンクの開放端縁の全周に沿ってほぼ四角形断面の取付
部１０が設けである。この取付部１０は互に半行で平ら
な表面を持つ内、外の作用面１１．１２とこれら内外作
用面に対して直角の内、外の９１１Ｊ壁面１３．１４と
を有する。A mounting portion 10 of approximately square cross section is provided along the entire circumference of the open edge of the tank. This mounting part 10 has inner and outer working surfaces 11.12 with flat surfaces half-row from each other and inner and outer 911J wall surfaces 13.14 at right angles to these inner and outer working surfaces.

本体１、すなわちチューブ７０９１１１面にはその上端
付近で周方向に黄銅製のコアプレート１６か適当な手段
、たとえば半田付、ろう付は等で固着しである。コアプ
レート１６の外周縁は内、外の側壁１７．１８および底
壁１９−を有する溝部２０となるように成形しである。A brass core plate 16 is fixed to the main body 1, that is, the surface of the tube 709111, in the circumferential direction near its upper end by suitable means such as soldering, brazing, etc. The outer periphery of the core plate 16 is shaped into a groove 20 having inner and outer side walls 17, 18 and a bottom wall 19-.

組立時、溝部２０忙タンク２の端縁取付部１０が嵌め込
まれ、このとき、取付部１ａの内、外の側壁面１３．１
４はそれぞれ溝部２０の内、外の側壁１７．１８と係合
し、取付部１０の内方作用面１１と溝部底壁１９の内面
との間には♂ム製０リングからなる弾性シール材２１が
設置される。During assembly, the edge attachment portion 10 of the tank 2 is fitted into the groove portion 20, and at this time, the inner and outer side wall surfaces 13.1 of the attachment portion 1a are fitted.
4 engages with the inner and outer side walls 17 and 18 of the groove 20, respectively, and between the inner working surface 11 of the mounting portion 10 and the inner surface of the groove bottom wall 19 is an elastic sealing material made of an O-ring made of ♂ rubber. 21 will be installed.

次に、頂縁につめ部２２を有するほぼ５字形（図では逆
り字形になっているが、反対情でを工り字形である）の
断面を持つ鉄板製のかしめプレート２３をコアプレート
１６の溝部２０に係合させ、つめ部２２をタンク２の端
縁取付部１０の外方作用面１２に向ってかしめる。その
結果、タンク端縁取付部１０はその内方作用面１１で弾
性シール材２１を変形すると共にコアプレート１６の溝
部２０に堅固に密封装着されることになる。なお、第２
図で、コアグレート溝部２０の外方側壁１８の、溝底壁
１ｇの内面からの高さｈが同じ内面からかしめ面、すな
わち取付部１０の外方作用面１２里での距離、すなわち
、かしめ高さＨとｔｔぼ同じとなっていることをご記憶
順いたい。Next, a caulking plate 23 made of an iron plate having an approximately 5-shaped cross section (inverted in the figure, but in the opposite case, it is in the shape of an inverted letter) with a claw portion 22 at the top edge is attached to the core plate 16. , and the pawl portion 22 is caulked toward the outwardly acting surface 12 of the edge attachment portion 10 of the tank 2 . As a result, the tank edge attachment portion 10 deforms the elastic sealing material 21 on its inner working surface 11 and is securely and sealingly attached to the groove portion 20 of the core plate 16. In addition, the second
In the figure, the height h of the outer side wall 18 of the core grate groove 20 from the inner surface of the groove bottom wall 1g is the distance from the inner surface to the caulking surface, that is, the outward acting surface 12 of the mounting portion 10, that is, the distance Please remember that the height H and tt are approximately the same.

以上の構成において、タンク２の内部Ａに存在する冷却
水が、コアグレート溝部２０の内面、タンク取付部１０
の内面および弾性シール、材２１の表面で形成されたす
きま部２４に浸透し、すきま腐食環境が生じる。すなわ
ち、すきま部２４に溜った液体中の腐食性成分が拡散し
に（い上に１黄銅製のコアプレート表面の不動態皮膜（
＃化皮膜）はその不動態を保持しようとしてすきま部２
４内の液体中の１１２票を消費し、そのため、すきま部
２４内の液体とタンク内の液体との間に酸素の濃度差が
生じ、酸素濃淡電池が形成される。その電池の作用によ
り、すきま部２４内の液体°の−が低下し、この結果生
じる腐食環境は非常釦きびしいものとなる。In the above configuration, the cooling water present in the interior A of the tank 2 is distributed between the inner surface of the core grate groove 20 and the tank mounting portion 10.
It penetrates into the gap 24 formed between the inner surface of the elastic seal and the surface of the material 21, creating a crevice corrosion environment. In other words, the corrosive components in the liquid accumulated in the gap 24 are diffused (1) and the passive film on the surface of the brass core plate (1).
# chemical film) tries to maintain its passivity and the gap 2
As a result, a difference in oxygen concentration occurs between the liquid in the gap 24 and the liquid in the tank, forming an oxygen concentration battery. Due to the action of the battery, the liquid level in the gap 24 is reduced, and the resulting corrosive environment becomes severe.

それに加えて、Ｗｃ２図に関連して先に指摘したように
％コアプレート溝部２０の外方側壁１８の高３ｈとかし
め高さ■とが等しいため、かしめゾＬ／−）２３のつめ
部２２の曲げ加工時に加わる曲げ荷重か溝部の外方側壁
１８を経て底壁１９に伝えられ、そこに引張応力を生じ
させ、かしめ作業終了後もこの応力が残留する・ 以上の条件の下で、コアプレート溝部２０の底壁１９に
応力腐食割れが容易に生じることは明らかである。この
事−実に本発明者らが始め【気付き。In addition, as pointed out earlier in connection with the Wc2 diagram, the height 3h of the outer side wall 18 of the core plate groove 20 is equal to the caulking height ■, so the claw portion 22 of the caulking zone L/-) 23 The bending load applied during the bending process is transmitted to the bottom wall 19 via the outer side wall 18 of the groove, producing tensile stress there, and this stress remains even after the crimping process is completed. Under the above conditions, the core It is clear that stress corrosion cracking easily occurs in the bottom wall 19 of the plate groove 20. This fact was first noticed by the inventors.

檜々の実験の結果、本発明に到達したのである。The present invention was arrived at as a result of Hinoki's experiments.

その際、アンモニア等の成分を多（含む通常の水を冷却
水として用いた場合、割れ寿命の一悪化が著しいことも
合わせて確認した。At that time, it was also confirmed that when ordinary water containing a large amount of components such as ammonia was used as cooling water, the cracking life deteriorated significantly.

以下、第４図を参照しながら応力発生のメカニズムをよ
り詳しく説明する。第４図の（イ）は、コアプレート溝
部２０の底に弾性シール材２１４’置きこの溝部２０に
りｙり端縁取付部１０を嵌め込り溝部２０の外面にかし
めプレート２３を係合させた段階を示す。このとき、か
しめ作業前なので、当然、溝部２θの底壁１９にはひず
みが生じて％、１ない。第４図の（ロ）の段階で、かし
め作業′４Ｉ：開始すると、かしめプレート２３のつめ
部２２Ｋｋ！斜め荷重Ｆ１がかかり、溝部２０の外方側
壁１８がタンク端縁取付部１０に押し付けられながら下
向きの力を受けて変形し、溝部２０の底壁１９に圧縮方
向のひずｋａ６が発生する。さらにかしめ作業が進行す
ると、第４図の（ハ）に示すように、荷重が完全に垂直
方向の荷重に変わり、それが外方側壁１８を経て溝部底
壁１９に伝わる。このとき、溝部２０の外面はかしめプ
レート２３で拘束されているため、溝部底壁１Ｓは弾性
シール材２１に向って凸状の変形を行ない、その表面に
引張り方向のびず入１１が生じる。第４図に）のかしめ
作業終了段階で、荷重Ｆ、か除かれ、かしめプレート２
３のつめ部２２かスジリングパック作用の下に上方に少
しもどる。したかつて、溝部底壁１９の表、　　面のび
ず入は６漏まで低下する。このとぎ、底壁１９は塑性変
形ひずみｅ、も含んであり、もしこの状態でかしめプレ
ート２３を除去して拘束を解いたならば、゛底壁１９は
弾性ひずみ量ε２　　’３の分だけ初期状態にもどるこ
とになる。この弾性ひずみ量ε雪ｇ＋ｓが応力腐食割れ
に参加するひすみ量。Hereinafter, the mechanism of stress generation will be explained in more detail with reference to FIG. In FIG. 4(a), an elastic sealing material 214' is placed at the bottom of the core plate groove 20, and the edge attachment part 10 is fitted into the groove 20, and the caulking plate 23 is engaged with the outer surface of the groove 20. It shows the stages that have been completed. At this time, since the caulking work has not yet been performed, naturally the bottom wall 19 of the groove portion 2θ is strained and is not strained by 1%. At stage (B) in FIG. 4, when the caulking work '4I: starts, the pawl portion 22Kk of the caulking plate 23! A diagonal load F1 is applied, and the outer side wall 18 of the groove 20 is pressed against the tank edge attachment part 10 and deforms under downward force, and a strain ka6 in the compression direction is generated in the bottom wall 19 of the groove 20. As the caulking work further progresses, the load completely changes to a vertical load, which is transmitted to the groove bottom wall 19 via the outer side wall 18, as shown in FIG. 4(C). At this time, since the outer surface of the groove 20 is restrained by the caulking plate 23, the groove bottom wall 1S deforms in a convex shape toward the elastic sealing material 21, and a crack 11 in the tensile direction is generated on the surface thereof. At the end of the caulking work (see Fig. 4), the load F is removed and the caulking plate 2
The claw portion 22 of No. 3 returns slightly upward under the action of the streaking pack. After that, the leakage on the surface of the groove bottom wall 19 decreased to 6 leakages. At this point, the bottom wall 19 also contains a plastic deformation strain e, and if the caulking plate 23 is removed and the restraint is released in this state, the bottom wall 19 will be initially affected by the elastic strain amount ε2'3. It will return to the state. This elastic strain amount ε snow g+s is the strain amount that participates in stress corrosion cracking.

である。そこで、第２図に示す従来構造（すなわちＨ−
ｈ＝ｏ）のひずみ発生パターンを実線で表わすと、溝部
底壁１９の表面に引張方向の弾性ひず入が生じているこ
とかわかる。It is. Therefore, the conventional structure shown in Fig. 2 (i.e., H-
When the strain generation pattern h=o) is represented by a solid line, it can be seen that elastic strain occurs in the tensile direction on the surface of the groove bottom wall 19.

本発明によれば、第３図に示すよ５［、コアプレート溝
部２０の外方側壁１８人がかしめ高さよりも小さい高さ
ｈ　ｔＷ　Ｌ、、本発明者らの実験によレバ、”ｓｈ！
７）Ｒ係がＦｉ　−ｈ≧０．５ｍであるならば、ひずみ
発生パターンが第４図のグラフに破°線で示すようなも
のとなることがわかった。これは。According to the present invention, as shown in FIG. !
7) It has been found that if the R factor is Fi -h≧0.5m, the strain generation pattern will be as shown by the broken line in the graph of FIG. this is.

かしめ作業時に発生する荷重が溝部底壁１９に伝わらず
、その表面のひずみが圧縮方向のみとなるからである。This is because the load generated during the caulking work is not transmitted to the groove bottom wall 19, and the strain on its surface is only in the compression direction.

そのため、かしめ作業終了時点においても、底壁の表面
に圧縮方向の弾性ひずみが生じていることになる。そこ
で、前記の弾性ひずみｉ（り一す）を応力σ−Ｅ（り一
り）（ここで、Ｅは縦弾性係数）で応力値に換算し、（
Ｈ−ｈ）を横軸に、整理した実験結果を第５図忙示す。Therefore, even at the end of the caulking work, elastic strain in the compression direction is generated on the surface of the bottom wall. Therefore, the above-mentioned elastic strain i (Riichisu) is converted into a stress value by stress σ-E (Riichisu) (here, E is the longitudinal elastic modulus), and (
Figure 5 shows the experimental results organized with H-h) as the horizontal axis.

この図から明らかなように、Ｈ−ｈ≧０．５關であれば
、溝部底壁１９の表面の応力は圧縮応力となりかつ安定
するのである。したがって、応力腐食割れの発生が著し
べ抑えられ、この部分での寿命が大幅に延びることにな
る。As is clear from this figure, if H-h≧0.5, the stress on the surface of the groove bottom wall 19 becomes compressive stress and becomes stable. Therefore, the occurrence of stress corrosion cracking is significantly suppressed, and the life of this part is significantly extended.

なお、本発明を実際の製品忙応用する場合、タンクの長
手方向の反り、弾性シール材の溝内での蛇行および部分
的な浮きとがり、さらにはチューブ８とコアプレート１
６０半田付は等の接合時に生じる熱ひず＆によるコアプ
レートの長手方向の反り等のバラツキを含む部品の組付
けに際し、かしめ前において取付部１０の下端がコアプ
レート１６の外方側壁１８Ａの内ｇｌＩＩ　Ｋ挿入され
ろようにして、組付は性を改善するためｔｆｃｋ工、（
Ｈ−ｈ）の上限値を２〜６關程度にすることが好ましい
。In addition, when the present invention is applied to an actual product, warping in the longitudinal direction of the tank, meandering and partial lifting of the elastic sealing material in the groove, and furthermore, the tube 8 and the core plate 1
When assembling parts that include variations such as warpage in the longitudinal direction of the core plate due to thermal strain and the like during soldering, the lower end of the mounting part 10 is attached to the outer side wall 18A of the core plate 16 before caulking. In order to insert the inner glII K, the assembly is done by tfck engineering, (
It is preferable to set the upper limit of H−h) to about 2 to 6 degrees.

また、市場を再現したテストにおいて、溝部底壁の表面
に発生する応力をゼロにした場合、応力腐食割れ寿命を
工従来のものに比べて１０倍以上となる。ただし、実負
荷として、溝部底壁の表面に発生する応カレエ前述のか
しめ時に生じる応力のほかに内圧、熱等の外部負荷も加
わるため、本発明の製品において、従来構造に比較して
応力腐食割れ寿命は２倍以上となることを確認した。In addition, in a test that replicated the market, when the stress generated on the surface of the bottom wall of the groove was reduced to zero, the stress corrosion cracking life was more than 10 times that of conventional engineering products. However, as an actual load, in addition to the stress generated during caulking that occurs on the surface of the groove bottom wall, external loads such as internal pressure and heat are also applied, so the product of the present invention suffers from stress corrosion compared to the conventional structure. It was confirmed that the cracking life was more than doubled.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明に係る自動車用ラジェータの正面図、 第２図は第１図のＸ−Ｘ線に沿った断面図であり、従来
の構造を示す図、 第６図は本発明による構造を示す、第２図と同様の図、 第４図は第２図に示す従来構造における作業段階を示す
図であって、そのグラフで実線は従来構造において発生
ずるひずみ、破線を工水発明構造において発生するひず
みをそれぞれ示す図、第５図は本発明の構造における発
生応力と（Ｅ−ｈ）値との関係を示すグラフである。 １・・・本体、２．３・・・タンク、１０・・・タンク
端縁取付部、１１・・・内方作用面、１２・・・外方作
用面、１３・・・内方側面、１４・・・外方９１Ｈｉｉ
、１６・・・コアプレート、１７・・・内方９ＩＩｌ壁
ｓ１８＊１８人・・・外方側壁、１９・・・底歇、２０
・・・溝部、２１・・・弾性シール材、２２・・・つめ
部、２３・・・かしめプレート、２４°°゛すきま部。 代理人　浅　村　　　皓 外４・名 巷間８訂１８−（：０１！Ｊ”バ４） 手続補正書（１釦 昭和５６年１　月夕日 −特許庁長官殿 １、事件の表示 熱交換器 ３、補正をする者 事件との関係　特許出願人 住　　所 氏　　名 格称、　　　　　（４２６）日本電装株式会社４、代理
人 ５、補正命令の日付 昭和　　年　　月　　日 ６、補正により増加する発明の数 ７、補正の対象 明細書の発明の詳細な説明の欄 １、　明細書第６頁第３行の「形成されたすきま部２４
に浸透し」を「形成された空間２４を経て、コアプレー
ト溝底壁１９と弾性シール材２１との間に形成されるす
きま部に浸透し」に訂正する。 ２、同第６頁第４行の１すきま部２４」を［溝底壁１９
と弾性シール材２１との間のすきま部」に訂正する。 ３、同６頁第７行の「すきま部２４」をｒｌこのすきま
部」に訂正する。 ４、同６頁第８行と第９行の「すきま部２４」を「この
すきま部」に訂正する。 ５、　同第６頁第１１行の「すきま部２４」をｒこのす
きま部」に訂正する。FIG. 1 is a front view of an automobile radiator according to the present invention, FIG. 2 is a cross-sectional view taken along the line X-X in FIG. 1, showing a conventional structure, and FIG. 6 is a structure according to the present invention. Figure 4 is a diagram showing the work steps in the conventional structure shown in Figure 2, in which the solid line represents the shear strain that occurs in the conventional structure, and the broken line represents the shear strain generated in the conventional structure. FIG. 5 is a graph showing the relationship between the stress generated in the structure of the present invention and the (Eh) value. DESCRIPTION OF SYMBOLS 1... Main body, 2.3... Tank, 10... Tank edge attachment part, 11... Inner action surface, 12... Outer action surface, 13... Inner side surface, 14...Outside 91Hii
, 16... Core plate, 17... Inner 9IIl wall s18*18 person... Outer side wall, 19... Bottom end, 20
...Groove portion, 21...Elastic sealing material, 22...Claw portion, 23...Caulking plate, 24°° gap portion. Agent Asamura Kōgai 4, Nakama 8th edition 18-(:01!J”ba 4) Procedural amendment (1 button, sunset of January 1981 – Mr. Commissioner of the Patent Office 1, case display heat exchanger 3, Relationship with the case of the person making the amendment: Patent applicant address, title, (426) Nippondenso Co., Ltd. 4, agent 5, date of amendment order, Showa year, month, day 6, number of inventions increased by amendment 7, Column 1 of the detailed description of the invention in the specification subject to amendment, page 6, line 3 of the specification, “Gap portion 24 formed
"infiltrates into" is corrected to "infiltrates into the gap formed between the core plate groove bottom wall 19 and the elastic sealing material 21 through the formed space 24." 2. Remove the 1st gap 24 on page 6, line 4 of the groove bottom wall 19.
and the elastic sealing material 21. 3. Correct "Gap 24" in line 7 of page 6 to "rl this gap". 4. Correct "Gap 24" in lines 8 and 9 of page 6 to "this gap". 5. Correct "Gap 24" on page 6, line 11 of the same page to "this gap".

Claims (1)

【特許請求の範囲】 金属製本体の上下端に密封装着したタンクを有し、各タ
ンクが取付側の南回周縁に沿って端縁取付部を有し、ま
た、前記本体の外周面に沿ってその上、下端付近にコア
プレートが設けてあり、各コアプレートの外周縁に沿っ
て前記り７りの端縁取付部を受は入れる溝部が形成して
あり、この溝部に前記タンク端縁取付部を嵌合させたと
きに、前記端縁取付部の内、外の側壁面が溝部の側壁内
面と係合するようになっており、かつ前記端縁取付部の
内側作用面と前記溝部の内底面との間に弾性シール材が
設置してあり、さらに、コアグレート溝部の側壁外面お
よび底壁外面と係合し、りｙり端縁取付部の外側作用面
に向ってかしめられてタンク端縁取付部をコアプレート
に固着するかしめプレートを包含する熱交換器において
１．前記タンク端縁取付部の外向き側壁面と係合してい
る。 前記コアプレート溝部の外ｆｌｌｌ側壁の溝内底面から
の高さをｈとし、同じ溝内底面からかしめプレートのか
しめられたタンク端縁取付部の外側作用面までの、かし
め時における高さをＨとしたとき、（Ｈ−ｈ）≧０．５
Ｂ となるようにしたことを特徴とする熱交換器。[Scope of Claims] Tanks are hermetically attached to the upper and lower ends of a metal body, each tank has an edge attachment portion along the southern periphery of the attachment side, and an edge attachment portion is provided along the outer circumferential surface of the body. In addition, a core plate is provided near the lower end, and grooves are formed along the outer periphery of each core plate to receive the seven edge attachment portions described above. When the attachment portions are fitted together, the inner and outer side wall surfaces of the edge attachment portion engage with the inner surface of the side wall of the groove, and the inner working surface of the edge attachment portion and the groove portion are configured to engage with each other. An elastic sealing material is installed between the inner bottom surface of the core grate groove, and is further engaged with the outer surface of the side wall and the outer surface of the bottom wall of the core grate groove, and is swaged toward the outer working surface of the edge attachment portion of the core grate. In a heat exchanger including a caulking plate for fixing a tank edge attachment portion to a core plate, 1. It engages with the outward side wall surface of the tank edge attachment portion. The height of the outer flll side wall of the core plate groove from the groove inner bottom surface is h, and the height from the same groove inner bottom surface to the outer working surface of the caulked tank edge attachment part of the caulking plate when caulking is H. When, (H-h)≧0.5
A heat exchanger characterized in that B.