JP2008164189A

JP2008164189A - Water cooling heat exchanger

Info

Publication number: JP2008164189A
Application number: JP2006351585A
Authority: JP
Inventors: Jun Ono; 小野　　純; Makoto Wada; 誠和田; Kazuhiko Kashiwagi; 和彦柏木; Atsushi Okubo; 厚大久保; Taiji Sakai; 耐事坂井
Original assignee: T Rad Co Ltd
Current assignee: T Rad Co Ltd
Priority date: 2006-12-27
Filing date: 2006-12-27
Publication date: 2008-07-17

Abstract

<P>PROBLEM TO BE SOLVED: To prevent generation of deflected flow of cooling water among flat tubes at a cooling water inlet portion in a water cooling heat exchanger in which the flat tubes are arranged in parallel with each other. <P>SOLUTION: A pair of chevron-shaped portions 7 formed into the shape of low mountains at both sides of a valley portion 11 at a center in the width direction of a transverse section, are formed on a second plane 6b of a casing 6 opposed to a cooling water inlet 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明はコアに多数の偏平チューブを並列したＥＧＲクーラにおいて、偏平チューブ間の各部に均一に冷却水を流通させるものに関する。 The present invention relates to an EGR cooler in which a large number of flat tubes are arranged in parallel with a core, and in which cooling water is circulated uniformly in each part between the flat tubes.

多数の偏平チューブを有し、ＥＧＲクーラとして用いる熱交換器が下記特許文献に記載されている。
この熱交換器は、一対のヘッダプレート間に多数の偏平チューブを並列してコアを構成し、そのコアの外周にケーシングを被嵌するとともに、コア両端に一対のヘッダを配置したものである。そして、ケーシングの両端部に入口パイプと出口パイプとを連通させ、入口パイプ側のヘッダから高温の排ガスを各偏平チューブに流通させ、冷却水によりそれを冷却させて、エンジンに供給するものである。 A heat exchanger having a number of flat tubes and used as an EGR cooler is described in the following patent document.
In this heat exchanger, a large number of flat tubes are arranged in parallel between a pair of header plates to constitute a core, a casing is fitted on the outer periphery of the core, and a pair of headers are disposed at both ends of the core. Then, the inlet pipe and the outlet pipe are communicated with both ends of the casing, the high-temperature exhaust gas is circulated from the header on the inlet pipe side to each flat tube, cooled by cooling water, and supplied to the engine. .

特開２００３−２２７６９５号公報JP 2003-227695 A

上記の熱交換器は、冷却水入口パイプ側ヘッダに高温の排ガスを導き、両流体が平行流をなす。このようにすることにより、比較的低温の冷却水によって最も高温時の排ガスを冷却し、ヘッダープレート近傍部に冷却水の沸騰が生じるのを可及的に防止するものである。
しかしながら、そのヘッダープレートの近傍の各部に冷却水が不均一に流通する偏流が起こると冷却水の流量の少ない部分において沸騰を起こし、熱交換器の耐久性が低下する。それとともに、熱交換性能が低下する。 Said heat exchanger guide | induces hot exhaust gas to a cooling water inlet pipe side header, and both fluids make a parallel flow. By doing so, the exhaust gas at the highest temperature is cooled by the relatively low temperature cooling water, and the boiling of the cooling water in the vicinity of the header plate is prevented as much as possible.
However, if a drift occurs in which the cooling water flows non-uniformly in each part in the vicinity of the header plate, boiling occurs in a portion where the flow rate of the cooling water is small, and the durability of the heat exchanger is lowered. At the same time, the heat exchange performance decreases.

図４はこの状態を示すもので、これは熱交換器の冷却水入口４における横断面説明図であり、冷却水入口４は第１の平面６ａの幅方向中心部に配置されている。そして、その冷却水入口４はこの例では並列された多数の偏平チューブ２の内、一対の偏平チューブ２ａにのみに対向する。そして、冷却水入口４から流入した冷却水９は一対の偏平チューブ２ａの間およびその偏平チューブ２ａと隣接する偏平チューブ２ｂとの間に導かれる。
ついで、第１の平面６ａに対向する第２の平面６ｂにそれが衝突すると、第２の平面６ｂに案内されて両側端に位置する偏平チューブ２ｃとケーシング６との間により多く冷却水９が流通する。さらにそれが再び第１の平面６ａの内面に衝突し、偏平チューブ２ｃと２ｂとの間および偏平チューブ２ｂと２ａとの間に分流する。その結果、最も冷却水９の流通量の少ないのは偏平チューブ２ｂと２ｃとの間である。すると、この部分に接するヘッダープレートの冷却水側表面に沸騰が起こり、その部分に劣化が生じる。 FIG. 4 shows this state, which is a cross-sectional explanatory view of the cooling water inlet 4 of the heat exchanger, and the cooling water inlet 4 is arranged at the center in the width direction of the first plane 6a. And in this example, the cooling water inlet 4 faces only a pair of flat tubes 2a among many flat tubes 2 arranged in parallel. The cooling water 9 flowing from the cooling water inlet 4 is guided between the pair of flat tubes 2a and between the flat tubes 2a and the adjacent flat tubes 2b.
Then, when it collides with the second flat surface 6b opposite to the first flat surface 6a, more cooling water 9 is guided between the flat surfaces 2b and the casings 6 which are guided by the second flat surface 6b and located at both ends. Circulate. Furthermore, it collides with the inner surface of the first flat surface 6a again, and the current flows between the flat tubes 2c and 2b and between the flat tubes 2b and 2a. As a result, the flow amount of the cooling water 9 is the least between the flat tubes 2b and 2c. Then, boiling occurs on the cooling water side surface of the header plate in contact with this portion, and the portion is deteriorated.

なお、この対策として第１の平面６ａの冷却水入口４近傍を漏斗状に形成し、図４のような偏流を防止する考え方も存在する。しかしながら、その場合にはケーシング６の成形が面倒で、結果として熱交換器のコストアップにつながる。
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。 As a countermeasure against this, there is a concept of forming the vicinity of the cooling water inlet 4 on the first plane 6a in a funnel shape to prevent the drift as shown in FIG. However, in that case, molding of the casing 6 is troublesome, resulting in an increase in the cost of the heat exchanger.
Therefore, an object of the present invention is to solve such problems.

請求項１に記載の本発明は、一対のヘッダープレート(1) 間に多数の偏平チューブ(2) が並列されたコア(3) と、
そのコア(3) の外周に被嵌され、その両端部に一対の冷却水入口(4)および冷却水出口が設けられた方形筒状のケーシング(6)と、を具備し、
その冷却水入口(4)は、一部の前記偏平チューブ(2) の断面の長軸側の一端面に対向してケーシング(6)の第１の平面(6a)で、その幅方向の中央位置に開口し、
その冷却水入口(4)に対向するケーシング(6)の第２の平面(6b)に、その横断面が幅方向の中心に谷部(11)を介して、その両側に低い山形に形成された一対の断面山形部(7) を有することを特徴とする水冷熱交換器である。 The present invention according to claim 1 includes a core (3) in which a number of flat tubes (2) are arranged in parallel between a pair of header plates (1);
A square cylindrical casing (6) fitted on the outer periphery of the core (3) and provided with a pair of cooling water inlets (4) and cooling water outlets at both ends thereof,
The cooling water inlet (4) is a first flat surface (6a) of the casing (6) opposite to one end surface on the long axis side of the cross section of some of the flat tubes (2), and is centered in the width direction. Open to position,
On the second plane (6b) of the casing (6) facing the cooling water inlet (4), the cross section is formed in a low angle shape on both sides via a trough (11) at the center in the width direction. A water-cooled heat exchanger characterized by having a pair of cross-sectional chevron portions (7).

請求項２に記載の本発明は、請求項１において、
前記断面山形部(7) は、前記第２平面(6b)の幅方向両端部まで達しないように形成され、それによりその両端位置の前記偏平チューブより中心側に積極的に冷却水を流通させるように構成した水冷熱交換器である。 The present invention according to claim 2 is the method according to claim 1,
The cross-sectional chevron (7) is formed so as not to reach both ends in the width direction of the second flat surface (6b), thereby allowing the cooling water to actively flow from the flat tubes at both ends to the center side. A water-cooled heat exchanger configured as described above.

請求項３に記載の本発明は、請求項１または請求項２において、
ＥＧＲクーラとして用いられる水冷熱交換器である。 According to a third aspect of the present invention, in the first or second aspect,
It is a water-cooled heat exchanger used as an EGR cooler.

本発明の水冷熱交換器は、冷却水入口４から流入した冷却水９が、対向する谷部１１に衝突して、一対の山形部７に分流し、その両側の一対の山形部７内で流速を減じるとともに、その山形部７に案内されて、特に幅方向両端部の各偏平チューブ２間の隙間に均一に冷却水９を流通させ、熱交換を促進させる効果がある。 In the water-cooled heat exchanger according to the present invention, the cooling water 9 flowing in from the cooling water inlet 4 collides with the opposing valley portions 11 and is divided into a pair of mountain portions 7, and within the pair of mountain portions 7 on both sides thereof. In addition to reducing the flow velocity, the cooling water 9 is guided through the chevron 7 and uniformly distributes the cooling water 9 in the gaps between the flat tubes 2 at both ends in the width direction, thereby promoting heat exchange.

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ＥＧＲクーラとして最適な熱交換器の横断面図であって、図２のＩ-Ｉ矢視断面図、図２は図１のII−II矢視断面略図である。 Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a heat exchanger optimal as an EGR cooler, and is a cross-sectional view taken along the line II in FIG. 2, and FIG. 2 is a schematic cross-sectional view taken along the line II-II in FIG.

この熱交換器は、一対のヘッダープレート１（右側を省略）間に多数の偏平チューブ２が並列されてコア３を構成し、そのコア３の外周にケーシング６が被嵌されている。そして、ケーシング６の長手方向一端に冷却水入口４が開口し、その開口に入口パイプ１２の一端が連通する。また、ケーシング６の長手方向他端には図示ない冷却水出口が開口し、それに図示ない出口パイプが連通する。
そして、冷却水入口４はケーシング６の幅方向中心部に開口し、それが並列された多数の偏平チューブ２の内、その幅方向中心部に位置する偏平チューブ２ａに対向する。そして、各偏平チューブ２の幅方向の端部とケーシング６内面との間はわずかに隙間が形成されている。 In this heat exchanger, a large number of flat tubes 2 are arranged in parallel between a pair of header plates 1 (not shown on the right side) to constitute a core 3, and a casing 6 is fitted on the outer periphery of the core 3. The cooling water inlet 4 opens at one end in the longitudinal direction of the casing 6, and one end of the inlet pipe 12 communicates with the opening. A cooling water outlet (not shown) is opened at the other longitudinal end of the casing 6, and an outlet pipe (not shown) communicates therewith.
And the cooling water inlet 4 opens in the center part of the width direction of the casing 6, and opposes the flat tube 2a located in the center part of the width direction among many flat tubes 2 in which it was arranged in parallel. A slight gap is formed between the end portion of each flat tube 2 in the width direction and the inner surface of the casing 6.

次にケーシング６の第１の平面６ａに対向する第２の平面６ｂであって入口パイプ１２に対向する位置には谷部１１を介し、その両側に低い山形に形成された一対の山形部７がプレス機械等により形成されている。
この例では各山形部７は、谷部１１とケーシング６の両側部との間に僅かの高さで滑らかに形成されている。また、各山形部７の長さは、冷却水入口４の開口の直径よりも少し長く形成されている。そして、山形部７によって冷却水のマニホールドを形成するとともに、その山形部７内面に案内されて、特にこの例では偏平チューブ２ｃと２ｂとの間に冷却水９を積極的に流通させるものである。 Next, a pair of chevron portions 7 formed on the both sides of the second flat surface 6b of the casing 6 facing the first flat surface 6a and facing the inlet pipe 12 through the troughs 11 at low chevron shapes. Is formed by a press machine or the like.
In this example, each mountain-shaped portion 7 is smoothly formed with a slight height between the valley portion 11 and both side portions of the casing 6. Further, the length of each chevron 7 is formed slightly longer than the diameter of the opening of the cooling water inlet 4. Then, a cooling water manifold is formed by the chevron 7 and guided to the inner surface of the chevron 7, and particularly in this example, the cooling water 9 is actively circulated between the flat tubes 2 c and 2 b. .

それによって偏平チューブ２ｃとケーシング６との間に流通しがちな冷却水９を、各隙間に均一に流通させる。それによって、入口パイプ１２近傍のヘッダープレート１の冷却水側の沸騰を防止する。それとともに、偏平チューブ２各部における偏流を可及的になくし、熱交換を促進しうる。
なお、山形部７および谷部１１の形状は、偏平チューブ２の数や冷却水入口４の形状および直径、その他により実験的にそれらを求めることができる。いずれにしても山形部７はケーシング６外周にわずかに形成すれば足り、その製造は容易なものとなる。 As a result, the cooling water 9 that tends to flow between the flat tube 2c and the casing 6 is made to uniformly flow through each gap. This prevents boiling of the header plate 1 near the inlet pipe 12 on the cooling water side. At the same time, uneven flow in each part of the flat tube 2 can be eliminated as much as possible, and heat exchange can be promoted.
In addition, the shape of the mountain-shaped part 7 and the trough part 11 can be experimentally calculated | required by the number of the flat tubes 2, the shape and diameter of the cooling water inlet 4, and others. In any case, it is sufficient to form the chevron portion 7 slightly on the outer periphery of the casing 6, and the manufacture thereof is easy.

次に図３は本発明の第２の実施の形態であり、この形態が図１のそれと異なる点は、山形部７の断面形状のみである。
この例では、各山形部７がケーシング６の幅方向端部まで達しないように、すなわちその端部は偏平チューブ２ｂと２ｃとの間の近傍に位置する。それにより、冷却水９を偏平チューブ２ｂと２ｃとの隙間に積極的に流通させるものである。 Next, FIG. 3 shows a second embodiment of the present invention, and this embodiment differs from that of FIG. 1 only in the cross-sectional shape of the chevron 7.
In this example, each chevron 7 does not reach the end of the casing 6 in the width direction, that is, the end is located in the vicinity between the flat tubes 2b and 2c. Thereby, the cooling water 9 is actively circulated through the gap between the flat tubes 2b and 2c.

本発明の水冷熱交換器の横断面図であり、図２のI−I矢視断面図。It is a cross-sectional view of the water-cooled heat exchanger of the present invention, and is a cross-sectional view taken along the line II in FIG. 同熱交換器の要部縦断面図であり、図１のII−II矢視断面図。It is a principal part longitudinal cross-sectional view of the same heat exchanger, and is II-II arrow sectional drawing of FIG. 本発明の他の水冷熱交換器の横断面図であって、図１に相当するもの。It is a cross-sectional view of another water-cooled heat exchanger of the present invention, and corresponds to FIG. 従来型水冷熱交換器の横断面説明図。Cross-sectional explanatory drawing of a conventional water-cooled heat exchanger.

Explanation of symbols

１ヘッダープレート
２，2a〜2c 偏平チューブ
３コア
４冷却水入口
６ケーシング
6a 第１の平面
6b 第２の平面 1 Header plate 2, 2a-2c Flat tube 3 Core 4 Cooling water inlet 6 Casing
6a First plane
6b Second plane

７山形部
８ヘッダ
９冷却水
10 排ガス
11 谷部
12 入口パイプ 7 Yamagata 8 Header 9 Cooling water
10 exhaust gas
11 Tanibe
12 inlet pipe

Claims

A core (3) in which a number of flat tubes (2) are arranged in parallel between a pair of header plates (1);
A square cylindrical casing (6) fitted on the outer periphery of the core (3) and provided with a pair of cooling water inlets (4) and cooling water outlets at both ends thereof,
The cooling water inlet (4) is a first flat surface (6a) of the casing (6) opposite to one end surface on the long axis side of the cross section of some of the flat tubes (2), and is centered in the width direction. Open to position,
On the second plane (6b) of the casing (6) facing the cooling water inlet (4), the cross section is formed in a low angle shape on both sides via a trough (11) at the center in the width direction. A water-cooled heat exchanger comprising a pair of cross-sectional chevron portions (7).

In claim 1,
The cross-sectional chevron (7) is formed so as not to reach both ends in the width direction of the second flat surface (6b), thereby allowing the cooling water to actively flow from the flat tubes at both ends to the center side. A water-cooled heat exchanger configured as described above.

In claim 1 or claim 2,
A water-cooled heat exchanger used as an EGR cooler.