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JP2004177058A - Egr cooler and its manufacturing method - Google Patents

Egr cooler and its manufacturing method Download PDF

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Publication number
JP2004177058A
JP2004177058A JP2002346564A JP2002346564A JP2004177058A JP 2004177058 A JP2004177058 A JP 2004177058A JP 2002346564 A JP2002346564 A JP 2002346564A JP 2002346564 A JP2002346564 A JP 2002346564A JP 2004177058 A JP2004177058 A JP 2004177058A
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Japan
Prior art keywords
groove
pair
egr cooler
casing
peripheral wall
Prior art date
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JP2002346564A
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JP4224768B2 (en
Inventor
Toshimichi Kobayashi
俊道 小林
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T Rad Co Ltd
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Toyo Radiator Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0219—Arrangements for sealing end plates into casing or header box; Header box sub-elements

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide an EGR cooler for reducing the number of part items, and facilitating manufacture by press molding. <P>SOLUTION: This EGR cooler has a pair of mutually matching groove-shaped bodies 2 and 3, and the groove-shaped bodies 2 and 3 integrally form a tank part 7 corresponding to a half in both end parts and a casing part 8 in an intermediate part by the press molding. A pair of header plates 5 penetrated and fixed with a large number of tubes 4 are formed in a thin pan shape having an annular peripheral wall part 9 by uplifting the whole peripheral edge, and a core 6 is constituted by matching the outer periphery of the annular peripheral wall part 9 with the inner periphery of a boundary part 10 between the casing part 8 and the tank part 7. This EGR cooler is formed in a cylindrical shape by butting the mutual edges of both side parts of the pair of groove-shaped bodies 2 and 3, and the core 5 is installed in the casing part 8, and the annular peripheral wall part 9 of the header plates 5 is positioned in the boundary part 10 of the groove-shaped body 2. A butting part of the groove-shaped bodies 2 and 3 is joined by welding, and the outer periphery of the boundary part 10 is annularly continued, and is welded and joined from the outer periphery. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、自動車エンジン等の排気ガス再循環装置に用いられる排気ガス冷却用のＥＧＲクーラおよびその製造方法に関し、多数のチューブとケーシングおよびヘッダとを有するものに関する。
【０００２】
【従来の技術】
シェル＆チューブと言われるＥＧＲクーラは、互いに離間して並列された多数のチューブの両端をヘッダプレートに貫通固定してコアを構成し、コアの外周にケーシングを被嵌すると共に、一対のヘッダプレートに夫々ヘッダ本体を取付ける。そしてケーシングにその長手方向に離間し一対の冷却水出入口パイプを連通させ、一方のヘッダから各チューブを介して他方ヘッダに排ガスを流通させ、チューブの外面側の冷却水によりそれを冷却するこものである。
このようなシェル＆チューブタイプの熱交換器は、その部品点数が多く、組立てが面倒である欠点があった。
【０００３】
そこで部品点数を少なくし、その組立てを容易とするものとして、一対の筒状部材により夫々ケーシングの半分とヘッダ本体とを形成し、その一対の筒状体を軸方向に端部連結して、その端部間をろう付け固定していた。
それと共に、ヘッダプレートの外周と夫々の筒状体との間もろう付けにより接合していた（例えば、特許文献１参照。）。
【０００４】
【特許文献１】
特開２００１０−２７２１８５号公報（第１図および第２図）
【０００５】
【発明が解決しようとする課題】
上記のヘッダープレートは、一対の筒状体を軸方向に繋ぎ合わせたものであり組立てが簡便である特徴があるものの、ヘッダ本体部とケーシング部と冷却水の流出入孔その他をプレート材から別成形により成形するには、多くの絞り型および工程を必要とし、結果的に生産コストが高くなる欠点があった。
そこで、本発明は製造し易く且つ部品点数の少ないＥＧＲクーラおよびその製造方法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、夫々の側壁部（１） の縁どうしが互いに整合するように、細長い溝状にプレス形成した一対の溝形本体（２） （３） と、
多数のチューブ（４） の両端部を一対のヘッダープレート（５） に貫通固定したコア（６） と、を用意し、
夫々の溝形本体（２） （３） は、両端部に半分相当のタンク部（７） を形成すると共に、中間部に半分相当のケーシング部（８） を一体に形成し、
夫々のヘッダープレート（５） の全周縁を立ち上げて環状周壁部（９） を有する浅い鍋形に形成し且つ、その環状周壁部（９） の外面を、夫々のケーシング部（８） とタンク部（７） との境部（１０）の内周に整合するように形成し、
前記一対の溝形本体（２） （３） の側壁部の縁どうしを突き合わして、筒形に形成すると共に、そのケーシング部（８） に前記コア（６） を内装して、前記環状周壁部（９） を前記境部（１０）に位置させ、
一対の溝形本体（２） （３） の突き合わせ部を溶接により接合すると共に、前記境部（１０）の外周を環状に連続して、その外周から溶接接合したことを特徴とするＥＧＲクーラの製造方法である。
【０００７】
請求項２に記載の本発明は、請求項１において、
前記溝形本体（２） （３） のケーシング部（８） の両端部に膨出部（１１）を一体に形成し、その膨出部（１１）に冷却用流体の出入口（１２）を開口したＥＧＲクーラの製造方法である。
請求項３に記載の本発明は、請求項１または請求項２に記載の製造方法により製造されたＥＧＲクーラである。
【０００８】
【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は本発明の製造方法により製造されたＥＧＲクーラの一部破断正面図であり、図２はその図１のＩＩ部拡大図である。また、図３は本ＥＧＲクーラの要部分解斜視図である。
このＥＧＲクーラは、多数のチューブ４と一対のヘッダープレート５とからなるコア６と上下一対の溝形本体２，３と一対のフランジ１４とからなる。コア６は、互いに離間して並列された多数のチューブ４の両端が一対のヘッダープレート５に液密および気密に貫通固定されている。
【０００９】
このヘッダープレート５は、全周縁を立ち上げてそこに環状周壁部９を形成した浅い鍋形を有する。その環状周壁部９は、後述する溝形本体２，３の境部１０の内面に整合する。溝形本体２，３は夫々同一形状を有し、その側壁部１の縁どうしが互いに整合する同一幅に形成されている。この溝形本体２，３は、プレス成形により一体に形成されるものであって、その両端部に夫々半分相当のタンク部７が形成されると共に、中間部に半分相当の細長いケーシング部８が一体に形成されている。
なお、タンク部７は先端が先細りとなる立体的なテーパに形成されている。
【００１０】
タンク部７とケーシング部８との中間には、膨出部１１が形成されている。そして、その膨出部１１とタンク部７との境に境部１０が存在する。この境部１０の内面側にコア６のヘッダープレート５の環状周壁部９が嵌着される。即ち、一方の溝形本体３のケーシング部８にコア６を挿入し、他方の溝形本体２をコア６の上方から被嵌する。そして溝形本体２の側壁部１の縁部と溝形本体３の側壁部１の縁部とを突き合わせ筒形に形成する。このとき、環状周壁部９は溝形本体２および溝形本体３の境部１０に位置され互いに接触する。次いで、溝形本体２，３により筒形を形成した両端に一対のフランジ１４の開口１９を嵌着し、各部品間を組み立てる。
【００１１】
次いで、側壁部１，溝形本体２の突き合わせ部をティグ溶接等により溶接すると共に、溝形本体２，３の境部１０においてその外周からレーザー溶接等により、溝形本体２とヘッダープレート５との間を一体に溶接する。このとき、その溶接部は境部１０において環状に形成される。図２の例では、２本の環状溶接部１５が並列して形成される。また、フランジ１４の開口１９とタンク部７の先端との間は、ティグ溶接等により溶接される。さらに溝形本体２，３には夫々出入口１２が形成され、そこにパイプ１３の端部が装着されその装着部が溶接固定されるものである。
【００１２】
このようにしてなるＥＧＲクーラは、一対のフランジ１４を介して図示しない排ガス循環路に介装され、排ガス１７が一方のタンク部７から流入し、夫々のチューブ４を介して他方のタンク部７に流通する。また、一方のパイプ１３から冷却水１８が流入し、膨出部１１を介して各チューブ４の外周に均一に流通し、他方のパイプ１３からそれが流出する。そして、その冷却水１８によって排ガス１７が冷却されるものである。
【００１３】
【発明の作用・効果】
本発明のＥＧＲクーラの製造方法およびそのＥＧＲクーラは、一対の溝形本体２，３の夫々の両端部にタンク部７が設けられ、中間部にケーシング部８が形成されたものである。そして、そのケーシング部８とタンク部７との境部１０にヘッダープレート５の環状周壁部９が位置されて、溶接により接合されるものであるから、部品点数が少なく且つ溶接が容易である。しかも、ヘッダープレート５はその外周に立上げられた環状周壁部９を有するため、一定の幅を有し、溝形本体２，３の外周からそれらと環状周壁部９との溶接が容易である。それにより、信頼性の高いＥＧＲクーラを提供できる。
【００１４】
上記構成において、溝形本体２，３のケーシング部８の両端部に膨出部１１を一体に形成し、その膨出部１１に出入口１２を開口することができる。
このようにすることにより、冷却用流体を各チューブ４の外面側に均一に流通させることができる。
【図面の簡単な説明】
【図１】本発明の製造方法により製造されたＥＧＲクーラの一部破断正面図。
【図２】図１のＩＩ部拡大断面図。
【図３】本発明のＥＧＲクーラの要部分解斜視図。
【符号の説明】
１ 側壁部
２，３ 溝形本体
４ チューブ
５ ヘッダープレート
６ コア
７ タンク部
８ ケーシング部
９ 環状周壁部
１０ 境部
１１ 膨出部
１２ 出入口
１３ パイプ
１４ フランジ
１５ 環状溶接部
１６ 突き合わせ溶接部
１７ 排ガス
１８ 冷却水
１９ 開口[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an exhaust gas cooling EGR cooler used for an exhaust gas recirculation device such as an automobile engine and a method of manufacturing the same, and more particularly, to a device having a large number of tubes, a casing, and a header.
[0002]
[Prior art]
An EGR cooler called a shell & tube is configured such that a core is formed by penetrating and fixing both ends of a large number of tubes spaced apart and arranged in parallel to a header plate, a casing is fitted around the outer periphery of the core, and a pair of header plates is provided. Attach the header body to each. Then, a pair of cooling water inlet / outlet pipes are communicated with the casing in the longitudinal direction, exhaust gas flows from one header to the other header through each tube, and is cooled by cooling water on the outer surface side of the tube. is there.
Such a shell-and-tube type heat exchanger has disadvantages that the number of parts is large and assembly is troublesome.
[0003]
Therefore, to reduce the number of parts and to facilitate the assembly, a half of the casing and a header main body are formed by a pair of tubular members, respectively, and the pair of tubular bodies are axially end-connected. Brazing was fixed between the ends.
At the same time, the outer periphery of the header plate and the respective cylindrical bodies are also joined by brazing (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-2010-272185 (FIGS. 1 and 2)
[0005]
[Problems to be solved by the invention]
The above-mentioned header plate is formed by connecting a pair of cylindrical bodies in the axial direction and has a feature that it is easy to assemble, but the header main body, the casing, the cooling water inflow / outflow holes and the like are separated from the plate material. Forming by molding requires many drawing dies and steps, resulting in a drawback that the production cost is increased.
Therefore, an object of the present invention is to provide an EGR cooler which is easy to manufacture and has a small number of parts, and a method for manufacturing the same.
[0006]
[Means for Solving the Problems]
The present invention according to claim 1 includes a pair of groove-shaped main bodies (2) (3) which are formed in an elongated groove shape so that edges of respective side wall portions (1) are aligned with each other.
A core (6) having both ends of a number of tubes (4) fixed through a pair of header plates (5);
Each of the groove-shaped main bodies (2) and (3) has a tank portion (7) corresponding to a half at both ends and a casing portion (8) corresponding to a half at an intermediate portion.
The entire peripheral edge of each header plate (5) is raised to form a shallow pan having an annular peripheral wall (9), and the outer surface of the annular peripheral wall (9) is formed with the respective casing (8) and tank. And formed so as to match the inner periphery of the boundary (10) with the part (7).
Edges of side wall portions of the pair of groove-shaped main bodies (2) and (3) are abutted with each other to form a cylindrical shape, and the casing (8) is provided with the core (6) therein, and the annular peripheral wall is provided. Part (9) is located at the border (10),
An EGR cooler characterized in that abutting portions of a pair of groove-shaped main bodies (2) and (3) are joined by welding, and an outer periphery of the boundary portion (10) is annularly continuous and welded from the outer periphery. It is a manufacturing method.
[0007]
The present invention described in claim 2 is based on claim 1,
A swelling portion (11) is integrally formed at both ends of the casing portion (8) of the channel-shaped body (2) (3), and an opening (12) for a cooling fluid is opened in the swelling portion (11). This is a method of manufacturing the EGR cooler.
According to a third aspect of the present invention, there is provided an EGR cooler manufactured by the manufacturing method according to the first or second aspect.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a partially cutaway front view of an EGR cooler manufactured by the manufacturing method of the present invention, and FIG. 2 is an enlarged view of a portion II in FIG. FIG. 3 is an exploded perspective view of a main part of the present EGR cooler.
The EGR cooler includes a core 6 composed of a number of tubes 4 and a pair of header plates 5, a pair of upper and lower grooved bodies 2, 3, and a pair of flanges 14. The core 6 has liquid-tight and air-tight ends fixed to a pair of header plates 5 at both ends of a large number of tubes 4 arranged in parallel at a distance from each other.
[0009]
The header plate 5 has a shallow pan shape in which an entire peripheral edge is raised and an annular peripheral wall portion 9 is formed thereon. The annular peripheral wall portion 9 is aligned with an inner surface of a boundary portion 10 between the channel-shaped main bodies 2 and 3 described later. The channel-shaped main bodies 2 and 3 have the same shape, and are formed to have the same width so that the edges of the side wall portions 1 are aligned with each other. The channel-shaped main bodies 2 and 3 are integrally formed by press molding. A half-equivalent tank portion 7 is formed at each of both end portions thereof, and a half-elongated elongated casing portion 8 is provided at an intermediate portion. It is formed integrally.
In addition, the tank part 7 is formed in a three-dimensional taper whose tip is tapered.
[0010]
A bulging part 11 is formed between the tank part 7 and the casing part 8. Then, a boundary portion 10 exists at a boundary between the bulging portion 11 and the tank portion 7. The annular peripheral wall 9 of the header plate 5 of the core 6 is fitted to the inner surface of the boundary 10. That is, the core 6 is inserted into the casing portion 8 of one of the channel-shaped main bodies 3, and the other channel-shaped main body 2 is fitted from above the core 6. The edge of the side wall 1 of the channel-shaped main body 2 and the edge of the side wall 1 of the channel-shaped main body 3 are abutted to form a cylinder. At this time, the annular peripheral wall portion 9 is located at the boundary 10 between the groove-shaped main body 2 and the groove-shaped main body 3 and is in contact with each other. Next, the openings 19 of the pair of flanges 14 are fitted to both ends of the cylindrical shape formed by the channel-shaped main bodies 2 and 3, and the components are assembled.
[0011]
Next, the butted portions of the side wall portion 1 and the grooved main body 2 are welded by TIG welding or the like, and the grooved main body 2 and the header plate 5 are joined to each other at the boundary 10 between the grooved main bodies 2 and 3 by laser welding or the like from the outer periphery thereof. Are welded together. At this time, the welded portion is formed in an annular shape at the boundary portion 10. In the example of FIG. 2, two annular welds 15 are formed in parallel. Further, a portion between the opening 19 of the flange 14 and the tip of the tank portion 7 is welded by TIG welding or the like. Further, an entrance 12 is formed in each of the channel-shaped main bodies 2 and 3, and an end of a pipe 13 is attached to the entrance 12 and the attachment portion is fixed by welding.
[0012]
The EGR cooler thus configured is interposed in an exhaust gas circulation path (not shown) through a pair of flanges 14, and the exhaust gas 17 flows in from one tank unit 7, and flows into the other tank unit 7 through the respective tubes 4. Distribute to. Further, cooling water 18 flows in from one pipe 13, uniformly flows around the outer circumference of each tube 4 via the bulging portion 11, and flows out from the other pipe 13. Then, the exhaust gas 17 is cooled by the cooling water 18.
[0013]
[Action and Effect of the Invention]
The method for manufacturing an EGR cooler of the present invention and the EGR cooler include a pair of channel-shaped main bodies 2 and 3 provided with tank portions 7 at both ends and a casing portion 8 formed at an intermediate portion. The annular peripheral wall portion 9 of the header plate 5 is located at the boundary 10 between the casing portion 8 and the tank portion 7 and is joined by welding, so that the number of parts is small and welding is easy. Moreover, since the header plate 5 has the annular peripheral wall portion 9 raised on the outer periphery thereof, the header plate 5 has a constant width, and it is easy to weld the annular peripheral wall portion 9 to the groove-shaped main bodies 2 and 3 from the outer periphery. . Thereby, a highly reliable EGR cooler can be provided.
[0014]
In the above configuration, the bulging portions 11 are integrally formed at both ends of the casing portion 8 of the channel-shaped main bodies 2 and 3, and the entrance 12 can be opened in the bulging portions 11.
By doing so, the cooling fluid can be uniformly distributed to the outer surface side of each tube 4.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view of an EGR cooler manufactured by a manufacturing method of the present invention.
FIG. 2 is an enlarged sectional view of a portion II in FIG.
FIG. 3 is an exploded perspective view of a main part of the EGR cooler of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Side wall part 2, 3 Channel-shaped main body 4 Tube 5 Header plate 6 Core 7 Tank part 8 Casing part 9 Annular peripheral wall part 10 Boundary part 11 Swelling part 12 Doorway 13 Pipe 14 Flange 15 Annular welding part 16 Butt welding part 17 Exhaust gas 18 Cooling water 19 opening

Claims (3)

夫々の側壁部（１） の縁どうしが互いに整合するように、細長い溝状にプレス形成した一対の溝形本体（２） （３） と、
多数のチューブ（４） の両端部を一対のヘッダープレート（５） に貫通固定したコア（６） と、を用意し、
夫々の溝形本体（２） （３） は、両端部に半分相当のタンク部（７） を形成すると共に、中間部に半分相当のケーシング部（８） を一体に形成し、
夫々のヘッダープレート（５） の全周縁を立ち上げて環状周壁部（９） を有する浅い鍋形に形成し且つ、その環状周壁部（９） の外面を、夫々のケーシング部（８） とタンク部（７） との境部（１０）の内周に整合するように形成し、
前記一対の溝形本体（２） （３） の側壁部の縁どうしを突き合わして、筒形に形成すると共に、そのケーシング部（８） に前記コア（６） を内装して、前記環状周壁部（９） を前記境部（１０）に位置させ、
一対の溝形本体（２） （３） の突き合わせ部を溶接により接合すると共に、前記境部（１０）の外周を環状に連続して、その外周から溶接接合したことを特徴とするＥＧＲクーラの製造方法。A pair of groove-shaped main bodies (2) and (3) pressed into an elongated groove so that the edges of the respective side walls (1) are aligned with each other;
A core (6) having both ends of a number of tubes (4) fixed through a pair of header plates (5);
Each of the groove-shaped main bodies (2) and (3) has a tank portion (7) corresponding to a half at both ends and a casing portion (8) corresponding to a half at an intermediate portion.
The entire peripheral edge of each header plate (5) is raised to form a shallow pan having an annular peripheral wall (9), and the outer surface of the annular peripheral wall (9) is formed with the respective casing (8) and tank. And formed so as to match the inner periphery of the boundary (10) with the part (7).
Edges of side wall portions of the pair of groove-shaped main bodies (2) and (3) are abutted with each other to form a cylindrical shape, and the casing (8) is provided with the core (6) therein, and the annular peripheral wall is provided. Part (9) is located at the border (10),
An EGR cooler characterized in that abutting portions of a pair of groove-shaped main bodies (2) and (3) are joined by welding, and an outer periphery of the boundary portion (10) is annularly continuous and welded from the outer periphery. Production method. 請求項１において、
前記溝形本体（２） （３） のケーシング部（８） の両端部に膨出部（１１）を一体に形成し、その膨出部（１１）に冷却用流体の出入口（１２）を開口したＥＧＲクーラの製造方法。In claim 1,
A swelling portion (11) is integrally formed at both ends of the casing portion (8) of the channel-shaped body (2) (3), and an opening (12) for a cooling fluid is opened in the swelling portion (11). Manufacturing method of an improved EGR cooler. 請求項１または請求項２に記載の製造方法により製造されたＥＧＲクーラ。An EGR cooler manufactured by the manufacturing method according to claim 1.
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WO2006018953A1 (en) * 2004-08-19 2006-02-23 T.Rad Co., Ltd. Heat exchanger
JP2007113795A (en) * 2005-10-18 2007-05-10 Usui Kokusai Sangyo Kaisha Ltd Multitubular heat exchanger for exhaust gas cooling device
JP2007178109A (en) * 2005-12-28 2007-07-12 Usui Kokusai Sangyo Kaisha Ltd Multitubular heat exchanger for exhaust gas cooling device
JP2009523994A (en) * 2006-01-23 2009-06-25 ベール ゲーエムベーハー ウント コー カーゲー Heat exchanger
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