JP4462847B2 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
JP4462847B2
JP4462847B2 JP2003145480A JP2003145480A JP4462847B2 JP 4462847 B2 JP4462847 B2 JP 4462847B2 JP 2003145480 A JP2003145480 A JP 2003145480A JP 2003145480 A JP2003145480 A JP 2003145480A JP 4462847 B2 JP4462847 B2 JP 4462847B2
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Prior art keywords
tube
insertion hole
flat
heat exchanger
flat tube
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JP2004347244A (en
Inventor
潔 佐々木
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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
    • 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
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
    • F28F9/182—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding the heat-exchange conduits having ends with a particular shape, e.g. deformed; the heat-exchange conduits or end plates having supplementary joining means, e.g. abutments
    • 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

Description

【０００１】
【発明の属する技術分野】
本発明は、自動二輪車用熱交換器として最適なものであって、そのコア平面が逆台形状のものに関する。
【０００２】
【従来の技術】
自動二輪車におけるエンジン冷却水冷却用熱交換器は、その配置スペースの関係上、熱交換器コアを逆台形状に形成したものが知られている（例えば、特許文献１参照。）。
これは、水冷多気筒エンジンの下方に熱交換器を配置したものにおいて、熱交換器の下端の幅を上端の幅に比べて小さくした形状のものである。このような熱交換器は偏平チューブを多数並列させると共に、各偏平チューブ間にコルゲートフィンを介装したものであって、チューブ長さが下方程短く形成され、チューブプレートの平面はチューブの軸線に対して直交せず斜めに配置され、そのチューブプレートにタンク本体が被嵌されたものである。
【０００３】
【特許文献１】
特開昭６３−１５４４８７号公報（第４図）
【０００４】
【発明が解決しようとする課題】
逆台形状に形成される自動二輪車用熱交換器は、図４に示す如く、夫々のチューブ１の軸線とチューブプレート３の平面とが直交せず傾斜し、チューブプレート３のチューブ挿通孔２にその傾斜状態でチューブ１の端部が挿通されている。
一般に、熱交換器はその製造工程で、ろう付け前にチューブの開口端部を拡開治具で拡開して、チューブ外周をチューブプレートのチューブ挿通孔に密着固定し、次いでその部分をろう付け固定していた。
【０００５】
ところが、図４の熱交換器ではチューブ１の軸線とチューブ挿通孔２の開口縁とが直交しないため、拡開具４によってチューブ１の開口端を拡開しようとすると、チューブ挿通孔２の孔縁部とチューブ１の外周とは密着せず、ろう付けの信頼性が損なわれるおそれがある。
また、他の従来型熱交換器としてチューブ端部を縮径して、その縮径部をチューブプレートのチューブ挿通孔に挿通するものも存在した。これを、台形状熱交換器に適用しようとすると、縮径部の形状が極めて複雑となり、面倒である。
そこで本発明は、係る問題点を解決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、互いに離間して平行に並列された多数の偏平なチューブ（１）と、夫々の偏平なチューブ（１）の両端部が挿通される多数の偏平なチューブ挿通孔（２）を有するチューブプレート（３）とを具備し、
夫々の偏平なチューブ（１）の端部を前記チューブ挿通孔（２）に挿通し、夫々のチューブ挿通孔（２）と偏平なチューブ（１）の端部外面との間を液密にろう付け固定してなる熱交換器において、
前記チューブプレート（３）の平面全体と、前記偏平なチューブ（１）の長手方向の軸線とが直交せず傾斜して配置され、
そのチューブプレート（３）の偏平な各チューブ挿通孔（２）の孔縁部（２ａ）のつくる平面を、偏平なチューブ（１）の軸線に直交するように、その孔縁部（２ａ）が塑性変形されてなり、
そのチューブ挿通孔（２）の長軸に直交するチューブプレート（３）の断面が、多数の不等辺な台形波状に形成されると共に、各台形の頂部が偏平なチューブ（１）の軸線に直交してなり、その頂部に前記チューブ挿通孔（２）がその内周面を偏平なチューブ（１）の軸線に平行に形成され、
そのチューブ挿通孔（２）に偏平なチューブ（１）の端部が挿通され、その端部に拡開具（４）が圧入され、その端部をチューブ挿通孔（２）の内周に均一に拡開して接続した状態で、夫々のチューブ挿通孔（２）と偏平なチューブ（１）の端部外面との間を液密にろう付け固定してなる熱交換器である。
【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は本発明の熱交換器の要部断面拡大図であって、図２は図１のII−II矢視略図、図３は同熱交換器の組立て状態を示す正面図である。
この熱交換器は、図３に示す如く並列された多数の偏平なチューブ１と、各チューブ１間に配置されたフィン６と、夫々のチューブ１の両端が貫通するチューブプレート３および、チューブプレート３に被嵌されるタンク本体12とを有する。さらに、チューブ１の並列方向の上下両端には、サポート材５が配置されている。そしてチューブ１の軸線とチューブプレート３の平面全体とが、図１に示す如く傾斜して配置されている。
【０００９】
チューブプレート３はチューブ１の並列方向に細長く形成され、その長手方向に定間隔に離間して多数のチューブ挿通孔２が並列されている。チューブプレート３の平面は、その横断面が図１の如く不等辺の台形状に形成されている。そして台形の頂部にチューブ挿通孔２が穿設され、そのチューブ挿通孔２の孔縁部２ａがチューブ１の軸線に直交する。これは一方の斜面13の断面長さが、他方の斜面14のそれよりも短く形成されているからである。そして各斜面13および14の裾に谷部11が形成され、それらがチューブ挿通孔２の長手方向に平行する。
また、チューブプレート３はその外周に環状溝部10が形成され、そこにタンク本体12の開口縁が嵌着する。
【００１０】
そして夫々のチューブ１の両端部をチューブプレート３のチューブ挿通孔２に挿通した状態で、チューブ１の断面に相似形な横断面を有するテーパー状の拡開具４を用意し、その拡開具４の先端部を夫々のチューブ１の端部に圧入し、チューブ１の端部を拡開する。そしてチューブ１の端部外周と、チューブ挿通孔２の内周面との隙間をなくし、チューブ１の両端部がチューブプレート３にカシメ固定される。
【００１１】
上記実施例では、チューブ１の端部開口を拡開したが、これに代えてチューブ端部を予め縮径し、その縮径部をチューブプレート３のチューブ挿通孔２に挿通してもよい。この場合、チューブ１の縮径部は、その長手方向の軸線に対して直交するように周方向形成すれば足りる。これは、チューブプレート３がチューブプレートの軸線に直交する通常の熱交換器の場合と同一の縮径構造である。
このチューブ１の縮径部の根元部が、チューブ挿通孔２の孔縁に均一に当接する。いずれにしても、そのチューブ１の外周には予めろう材が被覆され、各チューブ１間にはフィン６が配置される。次いでチューブプレート３の環状溝部10にタンク本体12の開口縁が嵌着された状態で、全体が高温の炉内に挿入される。
【００１２】
なお、互いに接触される各部品の少なくとも一方の外表面には、予めろう材が被覆される。係る状態で、高温の炉内に熱交換器組立体を挿入し、被覆されたろう材を溶融すると共にそれを冷却固化し、各部品間を一体的にろう付け固定して本熱交換器を完成する。
【００１３】
【発明の作用・効果】
本発明の熱交換器は、チューブプレート３の平面全体とチューブ１の長手方向の軸線とが、直交せず傾斜して配置された熱交換器であって、そのチューブプレート３のチューブ挿通孔２の孔縁部２ａのつくる平面を、チューブ１の軸線に直交するようにその孔縁部２ａが塑性変形されてなるから、チューブ１の端部をチューブ挿通孔２に挿通して拡開具４によってチューブ１の開口を拡開するとき、そのチューブ挿通孔２の孔縁部２ａとチューブ１の外周とは均一に密着され、チューブ挿通孔２におけるろう付けの信頼性を向上し得る。
即ち、チューブプレート３とチューブ１との挿通部は、チューブ１の軸線に直交しているため、拡開具４によりそのチューブ１の開口部を拡開したとき、挿通部において拡開が均一におこなわれ、両者の隙間をなくしてろう付けの信頼性を向上し得る。
【図面の簡単な説明】
【図１】本発明の熱交換器の要部断面図。
【図２】図１のII−II矢視図。
【図３】同熱交換器の組立て状態を示す正面略図。
【図４】従来型熱交換器の要部縦断面図。
【符号の説明】
１ チューブ
２ チューブ挿通孔
２ａ 孔縁部
３ チューブプレート
４ 拡開具
５ サポート材
６ フィン
７ 出入口パイプ
10 環状溝部
11 谷部
12 タンク本体
13，14 斜面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor heat exchanger that is optimal for a motorcycle, and whose core plane is an inverted trapezoid.
[0002]
[Prior art]
A heat exchanger for cooling engine coolant in a motorcycle is known in which the heat exchanger core is formed in an inverted trapezoidal shape due to the arrangement space (see, for example, Patent Document 1).
This is a configuration in which the heat exchanger is disposed below the water-cooled multi-cylinder engine, and the width of the lower end of the heat exchanger is smaller than the width of the upper end. In such a heat exchanger, a number of flat tubes are arranged in parallel, and corrugated fins are interposed between the flat tubes, and the tube length is shortened downward, and the plane of the tube plate is aligned with the tube axis. The tank body is disposed obliquely without being orthogonal to the tank plate, and the tank body is fitted on the tube plate.
[0003]
[Patent Document 1]
JP 63-154487 A (Fig. 4)
[0004]
[Problems to be solved by the invention]
As shown in FIG. 4, the motorcycle heat exchanger formed in an inverted trapezoidal shape is inclined so that the axis of each tube 1 and the plane of the tube plate 3 are not orthogonal to each other, and enters the tube insertion hole 2 of the tube plate 3. The end portion of the tube 1 is inserted in the inclined state.
In general, heat exchangers are manufactured during the manufacturing process by expanding the open end of the tube with an expansion jig before brazing, tightly fixing the outer periphery of the tube to the tube insertion hole of the tube plate, and then brazing that portion. It was fixed.
[0005]
However, in the heat exchanger of FIG. 4, the axis of the tube 1 and the opening edge of the tube insertion hole 2 are not orthogonal to each other. The part and the outer periphery of the tube 1 are not in close contact with each other, and the brazing reliability may be impaired.
In addition, as another conventional heat exchanger, there is one in which a tube end portion is reduced in diameter and the reduced diameter portion is inserted into a tube insertion hole of a tube plate. If this is applied to a trapezoidal heat exchanger, the shape of the reduced diameter portion becomes extremely complicated and troublesome.
Then, this invention makes it a subject to solve the problem which concerns.
[0006]
[Means for Solving the Problems]
The present invention of claim 1 includes a plurality of flat tubes (1) which are parallel in parallel apart from each other, a number of flat tubes through which both ends of each flat tube (1) is inserted A tube plate (3) having a hole (2),
The end of each flat tube (1) is inserted into the tube insertion hole (2), and the space between each tube insertion hole (2) and the outer end of the flat tube (1) is liquid-tight. In the heat exchanger that is attached and fixed,
The entire plane of the tube plate (3) and the longitudinal axis of the flat tube (1) are arranged so as to be inclined without being orthogonal,
The hole edge (2a) is formed so that the plane formed by the hole edge (2a) of each flat tube insertion hole (2) of the tube plate (3) is perpendicular to the axis of the flat tube (1). Ri name is plastically deformed,
The cross section of the tube plate (3) perpendicular to the long axis of the tube insertion hole (2) is formed into a number of unequal sides of trapezoidal waves, and the top of each trapezoid is perpendicular to the axis of the flat tube (1). The tube insertion hole (2) is formed at the top of the tube so that the inner peripheral surface thereof is parallel to the axis of the flat tube (1),
The end of the flat tube (1) is inserted into the tube insertion hole (2), and the spreader (4) is press-fitted into the end, and the end is uniformly placed on the inner periphery of the tube insertion hole (2). It is a heat exchanger formed by liquid-tightly brazing and fixing between each tube insertion hole (2) and the outer surface of the end of the flat tube (1) in a state of being expanded and connected .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
1 is an enlarged cross-sectional view of a main part of the heat exchanger of the present invention, FIG. 2 is a schematic view taken along the line II-II in FIG. 1, and FIG. 3 is a front view showing an assembled state of the heat exchanger.
This heat exchanger includes a number of flat tubes 1 arranged in parallel as shown in FIG. 3, fins 6 arranged between the tubes 1, a tube plate 3 through which both ends of the tubes 1 penetrate, and a tube plate 3 and a tank main body 12 to be fitted to 3. Further, support members 5 are arranged at both upper and lower ends of the tube 1 in the parallel direction. The axis of the tube 1 and the entire plane of the tube plate 3 are inclined as shown in FIG.
[0009]
The tube plate 3 is elongated in the parallel direction of the tubes 1, and a large number of tube insertion holes 2 are juxtaposed at regular intervals in the longitudinal direction. The flat surface of the tube plate 3 is formed in a trapezoidal shape whose cross section is unequal as shown in FIG. A tube insertion hole 2 is drilled at the top of the trapezoid, and a hole edge 2 a of the tube insertion hole 2 is orthogonal to the axis of the tube 1. This is because the cross-sectional length of one slope 13 is shorter than that of the other slope 14. A trough 11 is formed at the bottom of each of the slopes 13 and 14, and these are parallel to the longitudinal direction of the tube insertion hole 2.
Further, the tube plate 3 is formed with an annular groove 10 on the outer periphery thereof, and the opening edge of the tank body 12 is fitted therein.
[0010]
Then, in a state where both ends of each tube 1 are inserted into the tube insertion holes 2 of the tube plate 3, a taper-shaped spreader 4 having a cross section similar to the cross section of the tube 1 is prepared. The tip portion is press-fitted into the end portion of each tube 1, and the end portion of the tube 1 is expanded. Then, the gap between the outer periphery of the end portion of the tube 1 and the inner peripheral surface of the tube insertion hole 2 is eliminated, and both end portions of the tube 1 are caulked and fixed to the tube plate 3.
[0011]
In the above embodiment, the end opening of the tube 1 is expanded, but instead, the diameter of the tube end may be reduced in advance, and the reduced diameter portion may be inserted into the tube insertion hole 2 of the tube plate 3. In this case, it is sufficient if the reduced diameter portion of the tube 1 is formed in the circumferential direction so as to be orthogonal to the longitudinal axis. This is the same diameter-reduced structure as in the case of a normal heat exchanger in which the tube plate 3 is orthogonal to the axis of the tube plate.
The root portion of the reduced diameter portion of the tube 1 is in uniform contact with the hole edge of the tube insertion hole 2. In any case, the outer periphery of the tube 1 is coated with a brazing material in advance, and fins 6 are arranged between the tubes 1. Next, with the opening edge of the tank body 12 fitted in the annular groove 10 of the tube plate 3, the whole is inserted into a high-temperature furnace.
[0012]
In addition, the brazing material is previously coated on the outer surface of at least one of the components that are in contact with each other. In this state, the heat exchanger assembly is inserted into a high-temperature furnace, the coated brazing material is melted and cooled and solidified, and the parts are brazed and fixed together to complete the heat exchanger. To do.
[0013]
[Operation and effect of the invention]
The heat exchanger according to the present invention is a heat exchanger in which the entire plane of the tube plate 3 and the longitudinal axis of the tube 1 are arranged so as not to be orthogonal to each other, and are inclined, and the tube insertion hole 2 of the tube plate 3 is provided. Since the hole edge portion 2a is plastically deformed so that the plane formed by the hole edge portion 2a is orthogonal to the axis of the tube 1, the end portion of the tube 1 is inserted into the tube insertion hole 2 by the spreader 4. When the opening of the tube 1 is expanded, the hole edge 2a of the tube insertion hole 2 and the outer periphery of the tube 1 are uniformly adhered, and the reliability of brazing in the tube insertion hole 2 can be improved.
That is, since the insertion portion between the tube plate 3 and the tube 1 is orthogonal to the axis of the tube 1, when the opening portion of the tube 1 is expanded by the expansion tool 4, the expansion is uniformly performed at the insertion portion. Therefore, the reliability of brazing can be improved by eliminating the gap between the two.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a heat exchanger according to the present invention.
FIG. 2 is a view taken along the line II-II in FIG.
FIG. 3 is a schematic front view showing an assembled state of the heat exchanger.
FIG. 4 is a longitudinal sectional view of a main part of a conventional heat exchanger.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tube 2 Tube insertion hole 2a Hole edge part 3 Tube plate 4 Spreading tool 5 Support material 6 Fin 7 Entrance / exit pipe
10 Annular groove
11 Tanibe
12 Tank body
13, 14 slope

Claims (1)

互いに離間して平行に並列された多数の偏平なチューブ（１）と、夫々の偏平なチューブ（１）の両端部が挿通される多数の偏平なチューブ挿通孔（２）を有するチューブプレート（３）とを具備し、
夫々の偏平なチューブ（１）の端部を前記チューブ挿通孔（２）に挿通し、夫々のチューブ挿通孔（２）と偏平なチューブ（１）の端部外面との間を液密にろう付け固定してなる熱交換器において、
前記チューブプレート（３）の平面全体と、前記偏平なチューブ（１）の長手方向の軸線とが直交せず傾斜して配置され、
そのチューブプレート（３）の偏平な各チューブ挿通孔（２）の孔縁部（２ａ）のつくる平面を、偏平なチューブ（１）の軸線に直交するように、その孔縁部（２ａ）が塑性変形されてなり、
そのチューブ挿通孔（２）の長軸に直交するチューブプレート（３）の断面が、多数の不等辺な台形波状に形成されると共に、各台形の頂部が偏平なチューブ（１）の軸線に直交してなり、その頂部に前記チューブ挿通孔（２）がその内周面を偏平なチューブ（１）の軸線に平行に形成され、
そのチューブ挿通孔（２）に偏平なチューブ（１）の端部が挿通され、その端部に拡開具（４）が圧入され、その端部をチューブ挿通孔（２）の内周に均一に拡開して接続した状態で、夫々のチューブ挿通孔（２）と偏平なチューブ（１）の端部外面との間を液密にろう付け固定してなる熱交換器。Tube plate (3 with a number of flat tubes arranged in parallel in parallel spaced apart from each other (1), a number of flat tube passage hole which both end portions of the respective flat tube (1) is inserted (2) )
The end of each flat tube (1) is inserted into the tube insertion hole (2), and the space between each tube insertion hole (2) and the outer end of the flat tube (1) is liquid-tight. In the heat exchanger that is attached and fixed,
The entire plane of the tube plate (3) and the longitudinal axis of the flat tube (1) are arranged so as to be inclined without being orthogonal,
The hole edge (2a) is formed so that the plane formed by the hole edge (2a) of each flat tube insertion hole (2) of the tube plate (3) is perpendicular to the axis of the flat tube (1). Ri name is plastically deformed,
The cross section of the tube plate (3) perpendicular to the long axis of the tube insertion hole (2) is formed into a number of unequal sides of trapezoidal waves, and the top of each trapezoid is perpendicular to the axis of the flat tube (1). The tube insertion hole (2) is formed at the top of the tube so that the inner peripheral surface thereof is parallel to the axis of the flat tube (1),
The end of the flat tube (1) is inserted into the tube insertion hole (2), and the spreader (4) is press-fitted into the end, and the end is uniformly placed on the inner periphery of the tube insertion hole (2). A heat exchanger in which each tube insertion hole (2) and the outer surface of the end of the flat tube (1) are brazed and fixed in a liquid-tight manner in a state of being expanded and connected .
JP2003145480A 2003-05-22 2003-05-22 Heat exchanger Expired - Fee Related JP4462847B2 (en)

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