JP5079597B2 - Heat exchanger - Google Patents

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JP5079597B2
JP5079597B2 JP2008136897A JP2008136897A JP5079597B2 JP 5079597 B2 JP5079597 B2 JP 5079597B2 JP 2008136897 A JP2008136897 A JP 2008136897A JP 2008136897 A JP2008136897 A JP 2008136897A JP 5079597 B2 JP5079597 B2 JP 5079597B2
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casing
cooling water
heat exchanger
flat
brazed
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JP2009281703A (en
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孝輔 瀬口
耐事 坂井
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T.RAD CO., L T D.
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T.RAD CO., L T D.
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本発明は、ケーシング内面に偏平チューブのディンプルが接触し、その接触部がろう付け固定されてなる水冷熱交換器において、そのろう付け部の耐圧性を向上させたものに関する。   The present invention relates to a water-cooled heat exchanger in which a dimple of a flat tube is in contact with an inner surface of a casing and the contact portion is brazed and fixed, and the pressure resistance of the brazed portion is improved.

多数の偏平チューブが並列されてコアを構成し、そのコアの外周にケーシングが被嵌され、ケーシング内に冷却水が流通する熱交換器において、その偏平チューブの外面にチューブ間隔保持用の多数のディンプルが互いに離間して一体的に突設形成されたものが知られている。そのチューブの並列方向最外側のディンプルは、その先端面がケーシング内面に設けた同様のディンプルと接触し、その接触部分が一体にろう付け固定されることにより、両者間に隙間を形成し、そこに冷却水路が形成される。
そして、各チューブ内に被冷却流体が流通すると共に、チューブ外面側に冷却水が流通し、両流体間に熱交換が行われる。 In a heat exchanger in which a large number of flat tubes are arranged in parallel to form a core, a casing is fitted around the core, and cooling water flows through the casing, a large number of tube intervals are maintained on the outer surface of the flat tubes. There are known dimples that are spaced apart from each other and integrally formed. The dimple on the outermost side in the parallel direction of the tube is in contact with a similar dimple provided on the inner surface of the casing, and the contact portion is integrally brazed to form a gap between the two. A cooling water channel is formed.
And while a to-be-cooled fluid distribute | circulates in each tube, a cooling water distribute | circulates to the tube outer surface side, and heat exchange is performed between both fluids.

特許第３８７９６１号公報Japanese Patent No. 387961

従来の水冷型熱交換器の偏平チューブと、ケーシング内面とは図９に示す如く、両者が部分的に接触し、それ以外の部分に冷却水路６が形成されていた。すなわち、偏平チューブ１の外面にチューブ間隔保持用の多数のディンプル５が突設され、そのディンプル５の平坦面と、ケーシング４の凸部１８の平坦面とが接触し、それらの接触部が互いにろう付け固定されていた。
なお、偏平チューブ１内面にはインナーフィン１３が一体にろう付け固定されている。そして、冷却水路６側に加圧された冷却水３が流通し、偏平チューブ１内に被冷却流体１６が流通して、両者間に熱交換が行われるものである。 As shown in FIG. 9, the flat tube of the conventional water-cooled heat exchanger and the inner surface of the casing are in partial contact with each other, and the cooling water passage 6 is formed in the other part. That is, a large number of dimples 5 are provided on the outer surface of the flat tube 1 so as to maintain the interval between the tubes. The flat surface of the dimple 5 and the flat surface of the convex portion 18 of the casing 4 are in contact with each other. It was fixed by brazing.
An inner fin 13 is integrally fixed to the inner surface of the flat tube 1 by brazing. And the pressurized cooling water 3 distribute | circulates to the cooling water channel 6 side, the to-be-cooled fluid 16 distribute | circulates in the flat tube 1, and heat exchange is performed between both.

このような構造において、冷却水３による水圧がケーシング４内に加わると、凸部１８とディンプル５のろう付け部の周縁である図上Ｐ点に最大応力が発生する。このように水圧が加わり続けるか、あるいは繰り返し加圧力が加わると、Ｐ点から亀裂破壊が成長する。これは凸部１８とディンプル５部分のみで両者間がろう付けされ、そのろう付け面積が小さいので、そこに応力集中が起こるものである。これを防ぐには、偏平チューブ１およびケーシング４の板厚を厚くせざるをえなく、熱交換器の製造コストが高くになると共に、その重量が重くなる欠点があった。
そこで本発明はかかる問題点を解決することを課題とする。 In such a structure, when the water pressure by the cooling water 3 is applied to the casing 4, maximum stress is generated at a point P on the drawing, which is the periphery of the brazed portion of the convex portion 18 and the dimple 5. If the water pressure continues to be applied in this way, or a repeated pressure is applied, crack fracture grows from the point P. This is because only the convex portion 18 and the dimple 5 portion are brazed to each other and the brazed area is small, and stress concentration occurs there. In order to prevent this, the flat tube 1 and the casing 4 have to be made thicker, and the manufacturing cost of the heat exchanger is increased and the weight of the heat exchanger is increased.
Therefore, an object of the present invention is to solve such problems.

請求項１に記載の本発明は、内部に被冷却流体を流通させる複数の偏平チューブ(1)が並列されたコア(2)と、そのコア(2)の外周を被蔽して偏平チューブ(1) の外周に冷却水(3)が流通するケーシング(4)とを有し、
夫々の前記偏平チューブ(1)の外面にはチューブ間隔保持用の複数のディンプル(5)が互いに離間して一体的に突設形成され、並列された方向の最外側の偏平チューブ(1)の各ディンプル(5)が前記ケーシング(4)の内面に部分的に接触し且つ、その接触部がろう付け固定されて、ケーシング(4)とその偏平チューブ(1)との隙間に冷却水路(6)が形成される熱交換器において、
前記ケーシング(4)の内面には、対向する偏平チューブ(1)の各ディンプル(5)の先端面に整合して、それと接触してろう付け固定される複数の低い第１凸部(7)と、そのディンプル(5)に対してその平面方向両側に隣接する偏平チューブ(1)の隣接平面(8) に部分的に接触してろう付け固定される一対の高い第２凸部(9) と、を有することを特徴とする熱交換器である。
請求項２に記載の本発明は、請求項１において、
前記一対の第２凸部(9)と第１凸部(7)は、前記冷却水(3)の流通方向に一直線上に並列された熱交換器である。 The present invention as set forth in claim 1 includes a core (2) in which a plurality of flat tubes (1) through which a fluid to be cooled flows is arranged in parallel, and a flat tube (1) covering the outer periphery of the core (2). A casing (4) through which cooling water (3) circulates on the outer periphery of 1),
A plurality of dimples (5) for maintaining a tube interval are integrally formed on the outer surface of each of the flat tubes (1) so as to be spaced apart from each other, and the outermost flat tubes (1) in the juxtaposed direction are formed. Each dimple (5) is partially in contact with the inner surface of the casing (4), and the contact portion is brazed and fixed, and a cooling water channel (6) is formed in the gap between the casing (4) and the flat tube (1). In the heat exchanger in which
The inner surface of the casing (4) has a plurality of low first protrusions (7) aligned with the tip surfaces of the respective dimples (5) of the opposed flat tubes (1) and brazed and fixed in contact therewith. And a pair of high second protrusions (9) which are brazed and fixed partially in contact with the adjacent flat surfaces (8) of the flat tubes (1) adjacent to the dimples (5) on both sides in the plane direction. And a heat exchanger characterized by comprising:
The present invention according to claim 2 is the method according to claim 1,
The pair of second convex portions (9) and the first convex portions (7) are heat exchangers arranged in a straight line in the flow direction of the cooling water (3).

本発明の熱交換器は、ケーシング４内に冷却水３が流通する熱交換器において、そのケーシング４に対向する偏平チューブ１の各ディンプル５に、ケーシング４の第１凸部７が接触してろう付け固定されると共に、そのディンプル５の両側に隣接する隣接平面８にケーシング４の第２凸部９が接触してろう付け固定されるから、全体のろう付け面積を大きくして、加圧力を分散させて、耐圧性を向上する。
即ち、各ろう付け部に応力を分散して負担させ、過大な応力集中を防ぎ、ろう付けの信頼性を向上し、冷却水側の耐圧性を向上しうる。そして、比較的板厚の薄いケーシングおよび偏平チューブを用いることができ、軽量で安価な熱交換器を提供できる効果がある。
上記構成において、請求項２に記載のように、一対の第２凸部９と第１凸部７とを冷却水３の流通方向に一直線上に並列させた場合には、冷却水３の流通を円滑に行い、流通にともなう圧力損失を減じて熱交換を促進しうる。 In the heat exchanger of the present invention, in the heat exchanger in which the cooling water 3 flows in the casing 4, the first convex portion 7 of the casing 4 is in contact with each dimple 5 of the flat tube 1 facing the casing 4. In addition to being fixed by brazing, the second convex part 9 of the casing 4 is brought into contact with the adjacent flat surfaces 8 adjacent to both sides of the dimple 5 to be brazed and fixed. To improve pressure resistance.
That is, it is possible to disperse and bear stress in each brazed portion, prevent excessive stress concentration, improve brazing reliability, and improve the pressure resistance on the cooling water side. And a casing and a flat tube with comparatively thin plate | board thickness can be used, and there exists an effect which can provide a lightweight and cheap heat exchanger.
In the above configuration, when the pair of second convex portions 9 and the first convex portions 7 are arranged in a straight line in the flow direction of the cooling water 3 as described in claim 2, the flow of the cooling water 3 The heat exchange can be facilitated and the heat loss can be promoted by reducing the pressure loss associated with the distribution.

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縦断面図であって、図３におけるＩ−Ｉ矢視断面略図である。また、図２は図１のＩＩ部拡大図、図３は同熱交換器の正面図、図４は同側面図、図５は図２のＶ−Ｖ矢視断面図である。また、図６は本発明の熱交換器のケーシング４内面に設けた第１凸部７および第２凸部９の斜視略図である。そして、図７は同熱交換器に用いられる偏平チューブ１の斜視図、図８は同偏平チューブ１の積層状態を示すコア２の斜視略図である。 Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a main part of a heat exchanger according to the present invention, and is a schematic sectional view taken along line II in FIG. 2 is an enlarged view of part II in FIG. 1, FIG. 3 is a front view of the heat exchanger, FIG. 4 is a side view thereof, and FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is a schematic perspective view of the first convex portion 7 and the second convex portion 9 provided on the inner surface of the casing 4 of the heat exchanger of the present invention. FIG. 7 is a perspective view of the flat tube 1 used in the heat exchanger, and FIG. 8 is a schematic perspective view of the core 2 showing the laminated state of the flat tube 1.

この熱交換器は、図１に示す如く、偏平チューブ１が多数並列されたコア２と、その外周を被蔽するケーシング４とを有する。コア２は図８に示す如く、偏平チューブ１の積層体からなり、その偏平チューブ１は、図７に示す如く、その両端部（一方側の端部を省略）が厚み方向に拡開された断面方形の拡開部１aを有し、その拡開部１aを除いて多数のディンプル５が偏平チューブ１の表面および裏面の外側に夫々突設されている。このディンプル５は端面が平坦な円錐台形に形成され、その高さは拡開部１aの突出高さに等しい。また、拡開部１aはその開口が矩形に形成され、その中央の一方側に爪部１５が設けられ、他方側に欠切部１４が形成されている。
そして図８のごとく、それぞれの偏平チューブ１を積層したとき、各拡開部１aの外面が互いに接触し且つ、隣接する欠切部１４と爪部１５とが互いに嵌着される。また、それぞれのディンプル５が接触し、各偏平チューブ１間の隙間に冷却水路６が形成される。そして、各偏平チューブ１内にはインナーフィン１３が挿入されて、コア２を構成する。 As shown in FIG. 1, this heat exchanger has a core 2 in which a number of flat tubes 1 are arranged in parallel, and a casing 4 that covers the outer periphery thereof. As shown in FIG. 8, the core 2 is composed of a laminated body of flat tubes 1. The flat tube 1 has both ends thereof (omitted on one end) expanded in the thickness direction as shown in FIG. A widened portion 1a having a square cross section is provided, and a large number of dimples 5 project from the front and back surfaces of the flat tube 1 except for the widened portion 1a. The dimple 5 is formed in a truncated cone shape with a flat end surface, and its height is equal to the protruding height of the expanded portion 1a. Moreover, the opening part 1a has the opening formed in the rectangle, the nail | claw part 15 is provided in the one side of the center, and the notch part 14 is formed in the other side.
And when each flat tube 1 is laminated | stacked like FIG. 8, the outer surface of each expansion part 1a mutually contacts, and the adjacent notch part 14 and the nail | claw part 15 are mutually fitted. Further, the respective dimples 5 are in contact with each other, and a cooling water channel 6 is formed in a gap between the flat tubes 1. And the inner fin 13 is inserted in each flat tube 1, and the core 2 is comprised.

次に、図３，図４に示すケーシング４は、そのケーシング本体が箱状に形成され、その開口をケーシング蓋で閉塞する。そのケーシング４の長手方向両端には一対のタンク１１が一体に設けられると共に、コア収納部の側面に一対の冷却水タンク１０が一体に突設され、各タンク１１および冷却水タンク１０に出入口パイプ１２が連通される。ケーシング４の板厚は偏平チューブ１の板厚の数倍以上に形成され、それぞれは、金属板のプレス成形体よりなる。そして図３に示す如く、ケーシング４の内面側には、多数のディンプル状の第１凸部７と第２凸部９とが一体に突設形成されている。   Next, the casing 4 shown in FIGS. 3 and 4 has its casing body formed in a box shape, and its opening is closed with a casing lid. A pair of tanks 11 are integrally provided at both ends of the casing 4 in the longitudinal direction, and a pair of cooling water tanks 10 are integrally protruded on the side surface of the core housing portion. 12 is communicated. The plate thickness of the casing 4 is formed to be several times or more the plate thickness of the flat tube 1, and each is made of a press-formed body of a metal plate. As shown in FIG. 3, a large number of dimple-like first convex portions 7 and second convex portions 9 are integrally formed on the inner surface side of the casing 4.

即ち、ケーシング４の各ディンプルは、その長手方向に一直線上に一対の第２凸部９と第１凸部７とが、その内面側に突出形成されている。この第１凸部７は図２に示す如く、偏平チューブ１のディンプル５に整合して互いに接触し、一対の第２凸部９はディンプル５の両側に隣接した平坦な隣接平面８に接触する。そして、それらの接触部間がろう材１７により、一体にろう付け固定されるものである。   That is, each dimple of the casing 4 is formed with a pair of second protrusions 9 and first protrusions 7 protruding on the inner surface side in a straight line in the longitudinal direction. As shown in FIG. 2, the first convex portions 7 are in contact with each other in alignment with the dimples 5 of the flat tube 1, and the pair of second convex portions 9 are in contact with flat adjacent planes 8 adjacent to both sides of the dimple 5. . The contact portions are brazed and fixed together by a brazing material 17.

なお、第２凸部９は第１凸部７に対して冷却水の流通方向の上流側と下流側とのみに設けられ、それに直行する側は図５のごとく、第２凸部は存在しない。第２凸部９の高さは第１凸部７よりもディンプル５の突出分だけ高くなっている。そして、ケーシング４の第２凸部９、第１凸部７を除いて、ケーシング４内面と偏平チューブ１との隙間に冷却水路６が形成される。なお、各偏平チューブ１どうしはディンプル５において互いに接触しその接触部がろう付け固定される。さらには、偏平チューブ１の拡開部１aどうし及び、その拡開部１aとケーシング４との間も一体にろう付け固定される。それと共に、偏平チューブ１内に設けられたインナーフィン１３と偏平チューブ１内面との間も一体にろう付け固定される。   In addition, the 2nd convex part 9 is provided only in the upstream and downstream of the flow direction of cooling water with respect to the 1st convex part 7, and the 2nd convex part does not exist in the side which goes right to it like FIG. . The height of the second convex portion 9 is higher than the first convex portion 7 by the amount of protrusion of the dimple 5. And the cooling water channel 6 is formed in the clearance gap between the casing 4 inner surface and the flat tube 1 except the 2nd convex part 9 and the 1st convex part 7 of the casing 4. FIG. The flat tubes 1 are in contact with each other in the dimples 5 and the contact portions are brazed and fixed. Further, the widened portions 1a of the flat tubes 1 and the widened portion 1a and the casing 4 are also brazed and fixed integrally. At the same time, the inner fin 13 provided in the flat tube 1 and the inner surface of the flat tube 1 are also brazed and fixed integrally.

このようにしてなる熱交換器は、一例として一方のタンク１１の出入口パイプ１２から被冷却流体１６が流入し、各偏平チューブ１内を流通して他方のタンク１１および出入口パイプ１２からそれが流出する。そして、冷却水３が一方の冷却水タンク１０の出入口パイプ１２から流入し、各偏平チューブ１外周を流通して他方の冷却水タンク１０および出入口パイプ１２からそれが外部に導かれ、両流体間に熱交換が行われるものである。   In the heat exchanger thus configured, as an example, the cooled fluid 16 flows from the inlet / outlet pipe 12 of one tank 11, flows through each flat tube 1, and flows out from the other tank 11 and the inlet / outlet pipe 12. To do. And the cooling water 3 flows in from the inlet / outlet pipe 12 of one cooling water tank 10, distribute | circulates each flat tube 1 outer periphery, and it is guide | induced outside from the other cooling water tank 10 and the inlet / outlet pipe 12, and between both fluids The heat exchange is performed.

ケーシング４の内面は、前述のように部分的に偏平チューブ１外面とろう付け固定されるが、そのろう付け部は偏平チューブ１のディンプル５のみでなく、そのディンプル５を取り囲むように一対の第２凸部９においても、ろう付け固定される。そのため、ろう付け面積が大きくなり、水圧による応力が各部に分担される。即ち、ろう付け面積の増大により各部の応力分担が小さくなり、過度な応力集中を防止して、ろう付け部の強度を高くすることができる。それにより熱交換器の品質を向上すると共に、偏平チューブ１およびケーシング４の板厚を薄くすることができ、軽量で低価格の熱交換器を提供できることになる。それと共に、第２凸部９と第１凸部７とは冷却水の流れ方向に並列されているため、冷却水の流れを阻害することがない。   The inner surface of the casing 4 is partially brazed and fixed to the outer surface of the flat tube 1 as described above, but the brazed portion includes not only the dimple 5 of the flat tube 1 but also a pair of first so as to surround the dimple 5. The two convex portions 9 are also fixed by brazing. Therefore, the brazing area is increased, and the stress due to water pressure is shared by each part. That is, an increase in the brazing area reduces the stress sharing of each part, prevents excessive stress concentration, and increases the strength of the brazed part. As a result, the quality of the heat exchanger can be improved, and the flat tube 1 and the casing 4 can be made thinner, so that a heat exchanger that is lightweight and inexpensive can be provided. At the same time, the second convex portion 9 and the first convex portion 7 are arranged in parallel in the flow direction of the cooling water, so that the flow of the cooling water is not hindered.

本発明の熱交換器の要部縦断面図であって、図３のＩ−Ｉ矢視断面略図。It is a principal part longitudinal cross-sectional view of the heat exchanger of this invention, Comprising: The II sectional view schematic drawing of FIG. 図１のＩＩ部拡大図。The II section enlarged view of FIG. 同熱交換器の正面図。The front view of the heat exchanger. 同側面図。The same side view. 図２のＶ−Ｖ矢視断面略図。FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. 2.

ケーシング４内面に設けられた一対の第２凸部９と第１凸部７との斜視略図。The perspective schematic diagram of a pair of 2nd convex part 9 and the 1st convex part 7 which were provided in the casing 4 inner surface. 本熱交換器に用いられる偏平チューブ１の要部斜視図。The principal part perspective view of the flat tube 1 used for this heat exchanger. 同偏平チューブ１の積層体からなるコア２の斜視略図。The perspective schematic diagram of the core 2 which consists of a laminated body of the same flat tube 1. FIG. 従来型熱交換器におけるケーシング４と偏平チューブ１のディンプル５とのろう付け部を示す要部縦断面図。The principal part longitudinal cross-sectional view which shows the brazing part of the casing 4 and the dimple 5 of the flat tube 1 in a conventional heat exchanger.

符号の説明Explanation of symbols

１ 偏平チューブ
1a 拡開部
２ コア
３ 冷却水
４ ケーシング
５ ディンプル
６ 冷却水路
７ 第１凸部
８ 隣接平面 1 Flat tube
1a Expanding part 2 Core 3 Cooling water 4 Casing 5 Dimple 6 Cooling water channel 7 First convex part 8 Adjacent plane

９ 第２凸部
10 冷却水タンク
11 タンク
12 出入口パイプ
13 インナーフィン
14 欠切部
15 爪部
16 被冷却流体
17 ろう材
18 凸部 9 Second convex part
10 Cooling water tank
11 tanks
12 Entrance pipe
13 Inner fin
14 Notch
15 Nail
16 Fluid to be cooled
17 Brazing material
18 Convex

Claims (2)

内部に被冷却流体を流通させる複数の偏平チューブ(1)が並列されたコア(2)と、そのコア(2)の外周を被蔽して偏平チューブ(1) の外周に冷却水(3)が流通するケーシング(4)とを有し、
夫々の前記偏平チューブ(1)の外面にはチューブ間隔保持用の複数のディンプル(5)が互いに離間して一体的に突設形成され、並列された方向の最外側の偏平チューブ(1)の各ディンプル(5)が前記ケーシング(4)の内面に部分的に接触し且つ、その接触部がろう付け固定されて、ケーシング(4)とその偏平チューブ(1)との隙間に冷却水路(6)が形成される熱交換器において、
前記ケーシング(4)の内面には、対向する偏平チューブ(1)の各ディンプル(5)の先端面に整合して、それと接触してろう付け固定される複数の低い第１凸部(7)と、そのディンプル(5)に対してその平面方向両側に隣接する偏平チューブ(1)の隣接平面(8)に部分的に接触してろう付け固定される一対の高い第２凸部(9)と、を有することを特徴とする熱交換器。 A core (2) in which a plurality of flat tubes (1) for circulating a fluid to be cooled are arranged in parallel, and a cooling water (3) covering the outer periphery of the core (2) on the outer periphery of the flat tube (1) A casing (4) through which
A plurality of dimples (5) for maintaining a tube interval are integrally formed on the outer surface of each of the flat tubes (1) so as to be spaced apart from each other, and the outermost flat tubes (1) in the juxtaposed direction are formed. Each dimple (5) is partially in contact with the inner surface of the casing (4), and the contact portion is brazed and fixed, and a cooling water channel (6) is formed in the gap between the casing (4) and the flat tube (1). In the heat exchanger in which
The inner surface of the casing (4) has a plurality of low first protrusions (7) aligned with the tip surfaces of the respective dimples (5) of the opposed flat tubes (1) and brazed and fixed in contact therewith. And a pair of high second protrusions (9) which are brazed and fixed partially in contact with the adjacent flat surfaces (8) of the flat tubes (1) adjacent to the dimples (5) on both sides in the plane direction. And a heat exchanger. 請求項１において、
前記一対の第２凸部(9)と第１凸部(7)は、前記冷却水(3)の流通方向に一直線上に並列された熱交換器。 In claim 1,
The pair of second protrusions (9) and the first protrusions (7) are heat exchangers arranged in a straight line in the flow direction of the cooling water (3).
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