JP4634291B2 - EGR cooler - Google Patents

EGR cooler Download PDF

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JP4634291B2
JP4634291B2 JP2005347772A JP2005347772A JP4634291B2 JP 4634291 B2 JP4634291 B2 JP 4634291B2 JP 2005347772 A JP2005347772 A JP 2005347772A JP 2005347772 A JP2005347772 A JP 2005347772A JP 4634291 B2 JP4634291 B2 JP 4634291B2
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cooling water
case
inlet pipe
egr cooler
supply chamber
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JP2007154683A (en
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順 大西
芳和 加藤
俊道 小林
忠道 青山
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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
    • 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
    • F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
    • F28F9/0263—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits by varying the geometry or cross-section of header box
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
    • 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
    • F28F2009/0285—Other particular headers or end plates
    • F28F2009/029—Other particular headers or end plates with increasing or decreasing cross-section, e.g. having conical shape

Description

本発明は、排気ガスの一部をエンジンの吸気側に再循環させる系統に設けられ、排気ガスを冷却するＥＧＲクーラに関する。   The present invention relates to an EGR cooler that is provided in a system for recirculating a part of exhaust gas to the intake side of an engine and cools the exhaust gas.

近年、自然環境の保護に対する社会的関心が高まる中、車輌等のエンジンから排出される排気ガス中に含まれる窒素酸化物（ＮＯＸ）を削減させるため、車輌にＥＧＲ（Exhaust Gas Recirculation）装置を装着するケースが増えてきている。そして、このＥＧＲ装置には、エンジンにおける燃焼温度を低下させて窒素酸化物の生成量を低減させるため、排気ガスの一部をエンジンの吸気側に再循環させる系統に、排気ガスを冷却するＥＧＲクーラが設けられている。 In recent years, the increasing public concern for the protection of the natural environment, in order to reduce the nitrogen oxides contained in the exhaust gas discharged from an engine of the vehicle or the like (NO X), the EGR (Exhaust Gas Recirculation) device to the vehicle More and more cases are being worn. In this EGR device, in order to lower the combustion temperature in the engine and reduce the amount of nitrogen oxide produced, the EGR system cools the exhaust gas to a system that recirculates a part of the exhaust gas to the intake side of the engine. A cooler is provided.

従来のＥＧＲクーラ１は、図５に示すように、複数並設された扁平チューブ２と、扁平チューブ２の外周を囲繞するように筒状に形成されたケース３と、ケース３の両端部に設けられ、各扁平チューブ２の両端部が貫設されたヘッダプレート４とから概略構成されている。そして、ケース３の周壁部の各端部にはそれぞれ冷却水入口管５と冷却水出口管６が接続され、ケース３の各開口端部にはそれぞれ排気ガス入口管７と排気ガス出口管８が接続されており、冷却水入口管５及び冷却水出口管６と排気ガス入口管７及び排気ガス出口管８は、高温の排気ガスによって冷却水が沸騰するのを防止するため、冷却水と排気ガスとが互いに並行に流通するように配置されている。   As shown in FIG. 5, the conventional EGR cooler 1 includes a plurality of flat tubes 2, a case 3 formed in a cylindrical shape so as to surround the outer periphery of the flat tubes 2, and both ends of the case 3. A header plate 4 that is provided and has both end portions of each flat tube 2 penetrating therethrough. A cooling water inlet pipe 5 and a cooling water outlet pipe 6 are connected to each end portion of the peripheral wall portion of the case 3, and an exhaust gas inlet pipe 7 and an exhaust gas outlet pipe 8 are respectively connected to each opening end portion of the case 3. The cooling water inlet pipe 5, the cooling water outlet pipe 6, the exhaust gas inlet pipe 7 and the exhaust gas outlet pipe 8 are connected to the cooling water to prevent boiling of the cooling water by the high-temperature exhaust gas. It arrange | positions so that exhaust gas may mutually distribute | circulate in parallel.

このような構成において、冷却水入口管５からケース３内に流入した冷却水は、排気ガス入口管７から排気ガス出口管８に向かって各扁平チューブ２内を流通する排気ガスとの間で熱交換を行い、排気ガスを冷却した後、冷却水出口管６から流出するようになっている。   In such a configuration, the cooling water flowing into the case 3 from the cooling water inlet pipe 5 flows between the exhaust gas flowing through the flat tubes 2 from the exhaust gas inlet pipe 7 toward the exhaust gas outlet pipe 8. After performing heat exchange and cooling the exhaust gas, it flows out from the cooling water outlet pipe 6.

しかしながら、上記した従来のＥＧＲクーラ１では、ケース３内に流入した冷却水が冷却水入口管５から冷却水出口管６に向かって最短経路で流通し易く、各扁平チューブ２の間に冷却水を均等に流通させることが難しいため、ケース３の内部で冷却水が局部的に沸騰し、ＥＧＲクーラの耐久性を高めることが困難であった。   However, in the above-described conventional EGR cooler 1, the cooling water that has flowed into the case 3 easily flows along the shortest path from the cooling water inlet pipe 5 to the cooling water outlet pipe 6, and the cooling water is interposed between the flat tubes 2. Since it is difficult to distribute the water evenly, the cooling water locally boiled inside the case 3 and it was difficult to improve the durability of the EGR cooler.

そこで、最近では、ケースの内部全体に渡って冷却水を均等に流通させることを目的として、ケースの周壁部の一端部に環状の冷却水供給チャンバを外嵌装着すると共に、該冷却水供給チャンバに冷却水入口管を接続し、さらに、前記冷却水供給チャンバ内のケース部分に該冷却水供給チャンバの内部と前記ケースの内部とを連通する環状スリット孔を設けたＥＧＲクーラも提案されている（例えば、特許文献１参照）。
特開２００５−６９０６４号公報 Therefore, recently, an annular cooling water supply chamber is externally fitted to one end of the peripheral wall portion of the case for the purpose of evenly circulating the cooling water over the entire interior of the case, and the cooling water supply chamber There is also proposed an EGR cooler in which a cooling water inlet pipe is connected, and an annular slit hole is provided in a case portion in the cooling water supply chamber to communicate the inside of the cooling water supply chamber with the inside of the case. (For example, refer to Patent Document 1).
JP 2005-69064 A

しかしながら、上記した特許文献１に開示された従来のＥＧＲクーラでは、環状の冷却水供給チャンバをケースの周壁部に外嵌装着するようになっているため、冷却水供給チャンバをケースの外形に合せて精度良く製作する必要があった。そのため、寸法管理を厳格に行わなければならず、製作に手間が掛かり、コスト増大の要因となっていた。   However, in the conventional EGR cooler disclosed in Patent Document 1 described above, the annular cooling water supply chamber is externally fitted to the peripheral wall portion of the case, so the cooling water supply chamber is matched to the outer shape of the case. It was necessary to manufacture with high accuracy. For this reason, dimensional management has to be strictly performed, which takes time for production and causes an increase in cost.

また、冷却水供給チャンバをケースの外周に渡って設けなければならないため、外形が大きくなり、設置スペースを確保するのが難しいといった問題もあった。   Further, since the cooling water supply chamber must be provided over the outer periphery of the case, there is a problem that the outer shape becomes large and it is difficult to secure an installation space.

本発明は、上記した課題を解決すべくなされたものであり、冷却水の局部沸騰を防止すると共にＥＧＲクーラの耐久性を高め、製作が容易で、コストの低減化及び小型化を図ることのできるＥＧＲクーラを提供することを目的とするものである。   The present invention has been made to solve the above-mentioned problems, and prevents local boiling of the cooling water and enhances the durability of the EGR cooler, is easy to manufacture, and can reduce cost and size. An object of the present invention is to provide an EGR cooler that can be used.

上記した目的を達成するため、本発明は、複数並設されたチューブと、該チューブの外周を囲繞するように形成されたケースと、該ケースの両端部に設けられ、前記各チューブの両端部が貫設されたヘッダプレートとを備え、前記チューブ内を流通する排気ガスと、前記ケース内を流通する冷却水との間で熱交換を行うように構成されたＥＧＲクーラであって、基端部が前記ケースに接続されると共に、先端部に冷却水入口管が接続される冷却水供給チャンバを備えており、該冷却水供給チャンバは、前記先端部から前記基端部に向って漸次幅広となる形状を成し、該基端部の幅が前記ケースの幅に略等しくなるように形成されていることを特徴とする。   In order to achieve the above-described object, the present invention provides a plurality of tubes arranged in parallel, a case formed so as to surround the outer periphery of the tube, and both end portions of the tubes provided at both ends of the case. An EGR cooler configured to exchange heat between the exhaust gas flowing through the tube and the cooling water flowing through the case. And a cooling water supply chamber having a cooling water inlet pipe connected to the distal end portion, the cooling water supply chamber being gradually wider from the distal end portion toward the base end portion. The width of the base end is substantially equal to the width of the case.

そして、前記冷却水入口管は、前記先端部から前記基端部に向う冷却水の流通方向に対してほぼ直交するように、前記冷却水供給チャンバに接続されていてもよい。   The cooling water inlet pipe may be connected to the cooling water supply chamber so as to be substantially orthogonal to the flow direction of the cooling water from the tip portion toward the base end portion.

また、前記冷却水入口管は、その接続中心が前記ケースの幅方向の中心線の延長線上に来るように設けられており、前記冷却水供給チャンバは前記延長線に対して線対称となるように形成されていてもよい。   The cooling water inlet pipe is provided so that the connection center thereof is on an extension of the center line in the width direction of the case, and the cooling water supply chamber is symmetrical with respect to the extension line. It may be formed.

さらに、前記冷却水入口管は、その接続中心が前記ケースの幅方向の中心線の延長線上からオフセットした位置に来るように設けられており、前記冷却水供給チャンバは、前記冷却水入口管から前記ケースまでの流路の距離が短い程、該流路の幅が狭くなるように形成されていてもよい。   Further, the cooling water inlet pipe is provided so that a connection center thereof is offset from an extension of a center line in the width direction of the case, and the cooling water supply chamber is connected to the cooling water inlet pipe. It may be formed such that the shorter the distance of the flow path to the case, the narrower the width of the flow path.

本発明によれば、冷却水供給チャンバは、先端部から基端部に向って漸次幅広となる形状を成し、該基端部の幅が前記ケースの幅に略等しくなるように形成されているため、冷却水入口管から流入した冷却水は、冷却水供給チャンバから各チューブの間に均等に分配され、ケース内における冷却水の局部的な沸騰を抑制し、ＥＧＲクーラの耐久性を向上させることができる。   According to the present invention, the cooling water supply chamber has a shape that gradually increases from the distal end portion toward the proximal end portion, and is formed so that the width of the proximal end portion is substantially equal to the width of the case. Therefore, the cooling water flowing in from the cooling water inlet pipe is evenly distributed between the tubes from the cooling water supply chamber, and local boiling of the cooling water in the case is suppressed, improving the durability of the EGR cooler. Can be made.

また、冷却水供給チャンバは、先端部から基端部に向って漸次幅広となる単純な形状を成しているため、製造工程を簡略化でき、コストの低減化を図ることができる。   Moreover, since the cooling water supply chamber has a simple shape that gradually becomes wider from the distal end portion toward the proximal end portion, the manufacturing process can be simplified and the cost can be reduced.

さらに、外形幅寸法が最大となる冷却水供給チャンバの基端部の幅がケースの幅に略等しいため、小型化が図り易く、設置スペースの省スペース化が可能となる等、種々の優れた効果を得ることができる。   Furthermore, since the width of the base end portion of the cooling water supply chamber having the maximum outer width dimension is substantially equal to the width of the case, it is easy to reduce the size, and the installation space can be saved. An effect can be obtained.

以下、図面を参照しつつ、本発明の実施の形態について説明する。ここで、図１は本実施の形態に係るＥＧＲクーラを示す断面図、図２はＥＧＲクーラを示す正面図、図３は図２のＡ−Ａ矢視図、図４はその変形例を示す図である。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, FIG. 1 is a cross-sectional view showing the EGR cooler according to the present embodiment, FIG. 2 is a front view showing the EGR cooler, FIG. 3 is a view taken along the line AA in FIG. 2, and FIG. FIG.

本実施の形態に係るＥＧＲクーラ１１は、図１に示されているように、複数並設された扁平チューブ１２と、扁平チューブ１２の外周を囲繞するように角筒状に形成されたケース１３と、ケース１３の両端部に設けられ、各扁平チューブ１２の両端部が貫設されたヘッダプレート１４とを備えて構成されている。   As shown in FIG. 1, the EGR cooler 11 according to the present embodiment includes a plurality of flat tubes 12 and a case 13 formed in a rectangular tube shape so as to surround the outer periphery of the flat tubes 12. And a header plate 14 provided at both ends of the case 13 and through which both ends of each flat tube 12 are provided.

この場合、扁平チューブ１２は、分割された２部材を接合して形成された合わせチューブであり、その外側には多数のディンプル（図示省略）が形成されており、内部にはインナーフィン（図示省略）が挿入されている。なお、扁平チューブ１２は、溶接されたチューブであってもよく、また、必ずしも、外側にディンプルが形成されていなくてもよい。   In this case, the flat tube 12 is a mating tube formed by joining two divided members, and a large number of dimples (not shown) are formed on the outside thereof, and inner fins (not shown) are provided on the inside. ) Is inserted. The flat tube 12 may be a welded tube, and the dimples are not necessarily formed on the outside.

図１及び図２に示されているように、ケース１３の周壁部の一端部には冷却水供給チャンバ１５が接続され、この冷却水供給チャンバ１５に冷却水入口管１６が接続されており、また、ケース１３の周壁部の他端部には冷却水出口管１７が接続されている。これに対して、ケース１３の一方の開口端部には排気ガス入口管１８が接続され、ケース１３の他方の開口端部には排気ガス出口管１９が接続されており、これにより、ケース１３内において冷却水と排気ガスとが互いに並行に流通するようになっている。   As shown in FIGS. 1 and 2, a cooling water supply chamber 15 is connected to one end of the peripheral wall portion of the case 13, and a cooling water inlet pipe 16 is connected to the cooling water supply chamber 15, A cooling water outlet pipe 17 is connected to the other end portion of the peripheral wall portion of the case 13. On the other hand, an exhaust gas inlet pipe 18 is connected to one open end of the case 13, and an exhaust gas outlet pipe 19 is connected to the other open end of the case 13. The cooling water and the exhaust gas are circulated in parallel inside.

図３に良く示されているように、冷却水供給チャンバ１５は、先端部２０から基端部２１に向って漸次幅広となる形状を成しており、基端部２１の幅がケース１３の幅に略等しくなるように形成されている。そして、冷却水入口管１６は、先端部２０から基端部２１に向う冷却水の流通方向（図３中の矢印）に対してほぼ直交するように、先端部２０に接続されている。また、冷却水入口管１６は、その接続中心Ｐがケース３の幅方向の中心線ＣＬの延長線上に来るように設けられており、さらに、冷却水供給チャンバ１５は前記延長線に対して線対称となるように形成されている。   As shown well in FIG. 3, the cooling water supply chamber 15 has a shape that gradually becomes wider from the distal end portion 20 toward the proximal end portion 21, and the width of the proximal end portion 21 is the width of the case 13. It is formed so as to be approximately equal to the width. And the cooling water inlet pipe 16 is connected to the front-end | tip part 20 so that it may substantially orthogonally cross with respect to the distribution direction (arrow in FIG. 3) of the cooling water which goes to the base end part 21 from the front-end | tip part 20. As shown in FIG. The cooling water inlet pipe 16 is provided so that the connection center P thereof is on an extension of the center line CL in the width direction of the case 3, and the cooling water supply chamber 15 is connected to the extension line. It is formed to be symmetric.

なお、図１及び図２において、冷却水入口管１６は、冷却水供給チャンバ１５の正面視右側から接続されているが、図２の二点鎖線で示されているように、冷却水供給チャンバ１５の正面視左側から接続されていてもよい。   In FIG. 1 and FIG. 2, the cooling water inlet pipe 16 is connected from the right side of the cooling water supply chamber 15 as viewed from the front, but as shown by the two-dot chain line in FIG. 15 may be connected from the left side of the front view.

次に、図１〜図３を参照しつつ、本発明の実施の形態に係るＥＧＲクーラ１１の作用について説明する。   Next, the operation of the EGR cooler 11 according to the embodiment of the present invention will be described with reference to FIGS.

高温となったエンジンの排気ガスの一部は、排気ガス入口管１８から各扁平チューブ１２内を流通し、排気ガス出口管１９から、エンジンの吸気系に還流する。これに対して、冷却水は、冷却水入口管１６から冷却水供給チャンバ１５内に流入し、冷却水供給チャンバ１６内において先端部２０から基端部２１に向かって流通した後、ケース１３内に流入する。   A part of the exhaust gas of the engine that has reached a high temperature flows through each flat tube 12 from the exhaust gas inlet pipe 18 and recirculates from the exhaust gas outlet pipe 19 to the intake system of the engine. On the other hand, the cooling water flows into the cooling water supply chamber 15 from the cooling water inlet pipe 16 and flows from the front end portion 20 toward the base end portion 21 in the cooling water supply chamber 16 and then into the case 13. Flow into.

この時、冷却水入口管１６は、先端部２０から基端部２１に向う冷却水の流通方向に対してほぼ直交するように、先端部２０に接続されているため、冷却水は、冷却水入口管１６から冷却水供給チャンバ１５内に流入した勢いのまま直線的にケース１３内に流入することはない。また、冷却水供給チャンバ１６は先端部２０から基端部２１に向って漸次幅広となる形状を成し、基端部２１の幅がケース１３の幅に略等しくなるように形成されているため、冷却水供給チャンバ１５内に流入した冷却水は、図３において矢印で示すように、ケース１３の各扁平チューブ１２の間に向かって、均等且つ円滑に、所定の流速を保持した状態で、流通する。   At this time, since the cooling water inlet pipe 16 is connected to the distal end portion 20 so as to be substantially orthogonal to the flow direction of the cooling water from the distal end portion 20 toward the proximal end portion 21, the cooling water is the cooling water. The momentum flowing into the cooling water supply chamber 15 from the inlet pipe 16 does not flow linearly into the case 13. Further, the cooling water supply chamber 16 has a shape that gradually increases from the distal end portion 20 toward the proximal end portion 21, and is formed so that the width of the proximal end portion 21 is substantially equal to the width of the case 13. The cooling water flowing into the cooling water supply chamber 15 is maintained evenly and smoothly at a predetermined flow rate between the flat tubes 12 of the case 13, as indicated by arrows in FIG. Circulate.

このようにケース１３内に流入した冷却水は、その後、前記排気ガスの流れと並行に各扁平チューブ１２の間を流通し、冷却水出口管１７からＥＧＲクーラ１１の外部に流出し、その間、排気ガスと熱交換を行い、これにより、前記排気ガスは所望の状態に冷却される。   Thus, the cooling water that has flowed into the case 13 then flows between the flat tubes 12 in parallel with the flow of the exhaust gas, and flows out from the cooling water outlet pipe 17 to the outside of the EGR cooler 11, Heat exchange with the exhaust gas is performed, whereby the exhaust gas is cooled to a desired state.

上記したように、冷却水は、冷却水供給チャンバ１５から各扁平チューブ１２の間に均等且つ円滑に所定の流速を保持した状態で流入するため、最も高温となる扁平チューブ１２の排気ガスの入口部分を効果的に冷却することができ、ケース１３内での冷却水の局部的な沸騰を抑制し、ＥＧＲクーラ１１の耐久性を向上させることができる。   As described above, the cooling water flows from the cooling water supply chamber 15 between the flat tubes 12 while maintaining a predetermined flow rate evenly and smoothly, so that the exhaust gas inlet of the flat tubes 12 having the highest temperature is provided. The portion can be effectively cooled, local boiling of the cooling water in the case 13 can be suppressed, and the durability of the EGR cooler 11 can be improved.

なお、冷却水入口管１６は、図４に示されているように、その接続中心Ｐ’が前記ケースの幅方向の中心線ＣＬの延長線上からオフセットした位置に来るように、冷却水供給チャンバ１５の先端部２０に接続されてもよいが、その場合、冷却水供給チャンバ１５は、例えば、オフセットした側の傾斜面２２に凹部２３を形成させる等により、冷却水入口管１５からケース１３までの流路の距離が短い程、該流路の幅が狭くなるように形成されるのが好ましい。そうすることにより、冷却水入口管１５からケース１３までの流路の距離が短い（図４では上部側）程、冷却水の圧力損失が大きくなるため、冷却水が冷却水供給チャンバ１５から各扁平チューブ１２の間に均等に流入するようになり、ケース１３内における冷却水の局部的な沸騰を抑制し、ＥＧＲクーラ１１の耐久性を向上させることができる。   As shown in FIG. 4, the cooling water inlet pipe 16 has a cooling water supply chamber so that its connection center P ′ is offset from the extension of the center line CL in the width direction of the case. 15, the cooling water supply chamber 15 may be connected from the cooling water inlet pipe 15 to the case 13 by, for example, forming a recess 23 in the inclined surface 22 on the offset side. It is preferable that the width of the flow path be narrowed as the distance of the flow path becomes shorter. By doing so, since the pressure loss of the cooling water increases as the distance of the flow path from the cooling water inlet pipe 15 to the case 13 becomes shorter (upper side in FIG. 4), the cooling water flows from the cooling water supply chamber 15 to It comes to flow equally between the flat tubes 12, the local boiling of the cooling water in the case 13 can be suppressed, and the durability of the EGR cooler 11 can be improved.

なお、上記実施の形態では、本発明をＥＧＲクーラに適用した場合について説明したが、本発明は、ＥＧＲクーラ以外の他の熱交換器にも適用可能である。   In addition, although the case where this invention was applied to the EGR cooler was demonstrated in the said embodiment, this invention is applicable also to heat exchangers other than an EGR cooler.

本発明の実施の形態に係るＥＧＲクーラを示す断面図である。It is sectional drawing which shows the EGR cooler which concerns on embodiment of this invention. 本発明の実施の形態に係るＥＧＲクーラを示す正面図である。It is a front view which shows the EGR cooler which concerns on embodiment of this invention. 図２のＡ−Ａ矢視図である。It is an AA arrow line view of FIG. 図３の変形例を示す図である。It is a figure which shows the modification of FIG. 従来例を示す断面図である。It is sectional drawing which shows a prior art example.

符号の説明Explanation of symbols

１１ ＥＧＲクーラ
１２ 扁平チューブ
１３ ケース
１４ ヘッダプレート
１５ 冷却水供給チャンバ
１６ 冷却水入口管
２０ 先端部
２１ 基端部 DESCRIPTION OF SYMBOLS 11 EGR cooler 12 Flat tube 13 Case 14 Header plate 15 Cooling water supply chamber 16 Cooling water inlet pipe 20 Tip part 21 Base end part

Claims (2)

複数並設されたチューブと、該チューブの外周を囲繞するように形成されたケースと、該ケースの両端部に設けられ、前記各チューブの両端部が貫設されたヘッダプレートとを備え、前記チューブ内を流通する排気ガスと、前記ケース内を流通する冷却水との間で熱交換を行うように構成されたＥＧＲクーラであって、
基端部が前記ケースに接続されると共に、先端部に冷却水入口管が接続される冷却水供給チャンバを備えており、該冷却水供給チャンバは、前記先端部から前記基端部に向って漸次幅広となる形状を成し、該基端部の幅が前記ケースの幅に略等しくなるように形成され、前記冷却水入口管は、前記先端部から前記基端部に向う冷却水の流通方向に対してほぼ直交するように、前記冷却水供給チャンバの先端部に接続されていることを特徴とするＥＧＲクーラ。 A plurality of tubes arranged side by side, a case formed so as to surround the outer periphery of the tube, and a header plate provided at both ends of the case and having both ends of the tubes penetrated, An EGR cooler configured to exchange heat between exhaust gas flowing in a tube and cooling water flowing in the case,
A cooling water supply chamber having a proximal end connected to the case and a cooling water inlet pipe connected to the distal end is provided from the distal end toward the proximal end. The cooling water inlet pipe is formed so that the width of the base end portion becomes substantially equal to the width of the case, and the cooling water inlet pipe flows from the front end portion to the base end portion. An EGR cooler characterized in that the EGR cooler is connected to the tip of the cooling water supply chamber so as to be substantially orthogonal to the direction. 前記冷却水入口管は、その接続中心が前記ケースの幅方向の中心線の延長線上からオフセットした位置に来るように設けられており、前記冷却水供給チャンバは、前記冷却水入口管から前記ケースまでの流路の距離が短い程、該流路の幅が狭くなるように形成されている請求項１に記載のＥＧＲクーラ。
The cooling water inlet pipe is provided so that a connection center thereof is offset from an extension of a center line in the width direction of the case, and the cooling water supply chamber extends from the cooling water inlet pipe to the case. The EGR cooler according to claim 1, wherein the EGR cooler is formed so that the width of the flow path becomes narrower as the distance of the flow path becomes shorter.
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JP2013130391A (en) * 2013-03-19 2013-07-04 Sanoh Industrial Co Ltd Heat exchanger
JP6143335B2 (en) * 2013-03-28 2017-06-07 臼井国際産業株式会社 Multi-tube heat exchanger
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WO2017122832A1 (en) 2016-01-12 2017-07-20 株式会社ティラド Exhaust gas heat exchanger having stacked flat tubes
KR20230164749A (en) 2017-02-17 2023-12-04 가부시키가이샤 한도오따이 에네루기 켄큐쇼 Display device

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