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JP2014081175A - Casing connection structure of exhaust heat exchanger - Google Patents

Casing connection structure of exhaust heat exchanger Download PDF

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Publication number
JP2014081175A
JP2014081175A JP2012230666A JP2012230666A JP2014081175A JP 2014081175 A JP2014081175 A JP 2014081175A JP 2012230666 A JP2012230666 A JP 2012230666A JP 2012230666 A JP2012230666 A JP 2012230666A JP 2014081175 A JP2014081175 A JP 2014081175A
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casing
tank
outer periphery
heat exchanger
connection structure
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Hirohito Sugimoto
弘仁 杉本
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T Rad Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

【課題】 排気熱交換器において、コア３の外周を被嵌するケーシング４の端部が排気ガス９により高温になることを防止し、ケーシング４の材質を耐熱・耐食性の比較的低いもので形成し、低コストな熱交換器を提供すること。
【解決手段】 偏平チューブ２の積層体からなるコア３の端部にタンク５の端部を被嵌する。そして、そのタンク５の端部外周にケーシング４の端部を被嵌し、タンク５の端縁5aに冷却水８が導かれるようにする。このときケーシング４は、ニッケルの比較的少ない一般のステンレス鋼を用い、タンク５，偏平チューブ２に高耐食性ステンレス鋼を用いる。
【選択図】 図１PROBLEM TO BE SOLVED: To prevent an end portion of a casing 4 fitted on the outer periphery of a core 3 from being heated by an exhaust gas 9 in an exhaust heat exchanger, and to form the casing 4 with a material having relatively low heat resistance and corrosion resistance. And providing a low-cost heat exchanger.
An end portion of a tank 5 is fitted on an end portion of a core 3 made of a laminated body of flat tubes 2. Then, the end of the casing 4 is fitted on the outer periphery of the end of the tank 5 so that the cooling water 8 is guided to the end edge 5 a of the tank 5. At this time, the casing 4 is made of general stainless steel with relatively little nickel, and the tank 5 and the flat tube 2 are made of high corrosion resistance stainless steel.
[Selection] Figure 1

Description

本発明は、ヘッダプレートを有しない排気熱交換器のケーシング接続構造に関する。   The present invention relates to a casing connection structure for an exhaust heat exchanger having no header plate.

下記特許文献１には、ヘッダプレートを有しない排気熱交換器が記載されている。
これは、図５に示す如く、偏平チューブ２として、その短径方向に膨出部を設け、その膨出部において複数の偏平チューブを積層してコア３を構成する。そして、コア３の外周にケーシング４を被嵌し、そのケーシング４の端部に排気ガスのタンク５を接続したものである。そして、排気ガスのタンク５から高温の排気ガス９を各偏平チューブ２内に導き、その偏平チューブ２の外周に冷却水８を導いて、両流体間に熱交換を行うものである。 The following Patent Document 1 describes an exhaust heat exchanger that does not have a header plate.
As shown in FIG. 5, the flat tube 2 is provided with a bulging portion in the minor axis direction, and a plurality of flat tubes are stacked in the bulging portion to constitute the core 3. A casing 4 is fitted on the outer periphery of the core 3, and an exhaust gas tank 5 is connected to an end of the casing 4. Then, high-temperature exhaust gas 9 is guided from the exhaust gas tank 5 into each flat tube 2, and the cooling water 8 is guided to the outer periphery of the flat tube 2 to exchange heat between the two fluids.

ＷＯ２００６／１０２７３６WO2006 / 102736

図５に示すヘッダプレートの存在しない排気熱交換器は、高温の排気ガス９がタンク５からケーシング４を介し、各偏平チューブ２の内部に導かれる。このとき、ケーシング４の先端部内面は、直接排気ガス９にさらされ、高温の排気ガス９によって加熱される。そのため、ケーシング４の材質としては、耐熱、耐食性の高い高耐食性ステンレス鋼を用いていた。この高耐食性ステンレス鋼は、希少金属であるニッケルをより多く含み且つ、モリブデンをも含み、高価にならざるを得ない。特に、ケーシング４は熱交換器の外周を構成するため、強度上、板厚が厚く且つ、面積が広い。そのため、熱交換器の材料コストを上昇させていた。
そこで、本発明はニッケルの比較的少ない一般のステンレス鋼をケーシングとして用いても十分耐えうる排気熱交換器を提供することを課題とする。 In the exhaust heat exchanger without the header plate shown in FIG. 5, the hot exhaust gas 9 is guided from the tank 5 through the casing 4 to the inside of each flat tube 2. At this time, the inner surface of the front end of the casing 4 is directly exposed to the exhaust gas 9 and heated by the high-temperature exhaust gas 9. Therefore, as the material of the casing 4, high corrosion resistance stainless steel having high heat resistance and corrosion resistance has been used. This high corrosion resistance stainless steel contains more nickel, which is a rare metal, and also contains molybdenum, and must be expensive. In particular, since the casing 4 constitutes the outer periphery of the heat exchanger, the plate thickness is large and the area is wide in terms of strength. Therefore, the material cost of the heat exchanger has been increased.
Therefore, an object of the present invention is to provide an exhaust heat exchanger that can sufficiently withstand even a general stainless steel with relatively little nickel as a casing.

請求項１に記載の本発明は、両端開口部にその開口の短径方向へ膨出した膨出部(1)が設けられた複数の偏平チューブ(2)を有し、その膨出部(1)で各偏平チューブ(2)が前記短径方向に積層されてコア(3)を構成し、そのコア(3)の外周にケーシング(4)が被嵌され、そのケーシング(4)の端部に排気ガスのタンク(5)が接続され、それら各部品の接触部が互いにろう付け固定されて、
その排気ガスのタンク(5)を介して、各偏平チューブ(2)内に排気ガスが導かれると共に、ケーシング(4)内の冷却水が各偏平チューブ(2)の外周に導かれる排気熱交換器のケーシング接続構造において、
前記コア(3)の端部外周にタンク(5)の一端開口部を重ねて被嵌し、そのタンク(5)の一端開口部の外周にケーシング(4)の端部外周を重ねて被嵌し、そのタンク(5)の端縁(5a)がケーシング(4)内の冷却水に接するように構成し、
前記タンク(5)は高耐食性ステンレス鋼で形成し、前記ケーシング(4)は一般のステンレス鋼で形成したことを特徴とする排気熱交換器のケーシング接続構造である。 The present invention according to claim 1 has a plurality of flat tubes (2) provided with bulging portions (1) bulging in the minor axis direction of the opening at both end openings, and the bulging portions ( In 1), each flat tube (2) is laminated in the minor axis direction to form a core (3), and a casing (4) is fitted on the outer periphery of the core (3), and the end of the casing (4) The exhaust gas tank (5) is connected to the parts, and the contact parts of these parts are fixed to each other by brazing.
Exhaust gas is introduced into each flat tube (2) through the exhaust gas tank (5), and the cooling water in the casing (4) is led to the outer periphery of each flat tube (2). In the casing connection structure of the vessel,
One end opening of the tank (5) is put on the outer periphery of the end of the core (3), and the outer periphery of the end of the casing (4) is put on the outer periphery of the one end opening of the tank (5). And the end edge (5a) of the tank (5) is configured to come into contact with the cooling water in the casing (4),
The tank (5) is made of high corrosion resistance stainless steel, and the casing (4) is made of general stainless steel.

請求項２に記載の本発明は、請求項１に記載のケーシング接続構造において、
前記偏平チューブ(2)は、高耐食性ステンレス鋼で形成され、その板厚が前記ケーシング(4)の板厚およびタンク(5)の板厚より薄く形成された排気熱交換器のケーシング接続構造である。
請求項３に記載の本発明は、請求項１または請求項２に記載のケーシング接続構造において、
前記ケーシング(4)の端部外周で、前記タンク(5)の端縁に隣接した位置にコア(3)側に凹陥した絞り部(6)が設けられ、その絞り部(6)の縁がタンク(5)の端縁(5a)に係止されて、両者が互いに位置決めされた排気熱交換器のケーシング接続構造である。 According to a second aspect of the present invention, in the casing connection structure according to the first aspect,
The flat tube (2) is made of highly corrosion-resistant stainless steel, and has a casing connection structure for an exhaust heat exchanger in which the plate thickness is smaller than the plate thickness of the casing (4) and the plate thickness of the tank (5). is there.
According to a third aspect of the present invention, in the casing connection structure according to the first or second aspect,
On the outer periphery of the end of the casing (4), there is provided a throttle part (6) recessed in the core (3) side at a position adjacent to the edge of the tank (5), and the edge of the throttle part (6) This is a casing connection structure for an exhaust heat exchanger, which is locked to the edge (5a) of the tank (5) and positioned with respect to each other.

本発明は、コア３の端部外周にタンク５の一端開口部を重ねて被嵌し、そのタンク５の一端開口部の外周にケーシング４の端部外周を重ねて被嵌し、そのタンク５の端縁5aがケーシング４内の冷却水に接するように構成したので、ケーシング４には高温の排気ガスが接することがない。そのため、ケーシング４は、高耐食性ステンレス鋼の材質より、耐熱、耐腐食性の低い一般のステンレス鋼で形成することができる。それにより、熱交換器の外周を形成する比較的板厚の厚く、面積の広いケーシング材料を安価に入手することができ、量産性の高い熱交換器を安価に提供できる。なお、排気ガスを導くタンク５は高耐食性ステンレス鋼で形成するが、その大きさはケーシングに比べて一般的に小さいので、それによる熱交換器のコストの上昇を抑制できる。   In the present invention, one end opening of the tank 5 is fitted over the outer periphery of the end of the core 3, and the outer periphery of the end of the casing 4 is fitted over the outer periphery of the one end opening of the tank 5. Since the edge 5a of the casing is in contact with the cooling water in the casing 4, the casing 4 is not in contact with hot exhaust gas. Therefore, the casing 4 can be formed of general stainless steel having lower heat resistance and corrosion resistance than the material of high corrosion resistance stainless steel. As a result, a casing material having a relatively large thickness and a large area that forms the outer periphery of the heat exchanger can be obtained at low cost, and a heat exchanger with high mass productivity can be provided at low cost. In addition, although the tank 5 which guides exhaust gas is formed with high corrosion resistance stainless steel, since the magnitude | size is generally small compared with a casing, the raise of the cost of the heat exchanger by it can be suppressed.

請求項２に記載の発明は、その偏平チューブ２の板厚を前記ケーシング４の板厚およびタンク５の板厚より薄くしたので、その材料を高耐食性ステンレス鋼で形成しても、熱交換器のコストの上昇を抑制できる。
請求項３に記載の発明は、ケーシング(4)の端部外周で、前記タンク(5)の端縁に隣接した位置にコア(3)側に凹陥した絞り部(6)を設け、その絞り部(6)の縁をタンク(5)の端縁(5a)に係止させて、両者を互いに位置決めしたので、組立てが容易で、ろう付け中の各部品の位置ずれを防止し、信頼性の高い熱交換器を提供できる。 Since the thickness of the flat tube 2 is made thinner than the thickness of the casing 4 and the thickness of the tank 5, the heat exchanger is provided even if the material is made of high corrosion resistance stainless steel. Increase in cost can be suppressed.
According to a third aspect of the present invention, there is provided a throttle part (6) recessed in the core (3) side at a position adjacent to the edge of the tank (5) on the outer periphery of the end part of the casing (4). Since the edge of the part (6) is locked to the end edge (5a) of the tank (5) and both are positioned with respect to each other, assembly is easy, and displacement of each part during brazing is prevented, and reliability High heat exchanger.

本発明の排気熱交換器のケーシング接続構造の要部断面図。The principal part sectional drawing of the casing connection structure of the exhaust heat exchanger of this invention. 図１のII−II矢視断面図。II-II arrow sectional drawing of FIG. 図１のIII−III矢視断面図。III-III arrow sectional drawing of FIG. 同熱交換器の分解斜視図。The exploded perspective view of the heat exchanger. 従来型排気熱交換器の要部縦断面図。The principal part longitudinal cross-sectional view of the conventional exhaust heat exchanger.

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。
本発明の排気熱交換器は、図４に示すごとく、偏平チューブ２の積層体からなるコア３と、その外周を被嵌するケーシング４と、コア３の両端部に配置される一対のタンク５とを有する。 Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 4, the exhaust heat exchanger of the present invention includes a core 3 made of a laminated body of flat tubes 2, a casing 4 that fits the outer periphery thereof, and a pair of tanks 5 that are disposed at both ends of the core 3. And have.

コア３を構成する各偏平チューブ２は、図２に示すごとく、溝形に形成された一対のプレート2aとプレート2bとの嵌着体からなる。そして、図１に示すごとく、その両端部が短径方向に膨出した膨出部１を有し、その膨出部１において多数の偏平チューブ２が積層されてコア３を形成している。そして、そのコア３の両端に一対のタンク５が被嵌される。すなわち、コア３の外周に整合したタンク５の内面がそこに被嵌される。   As shown in FIG. 2, each of the flat tubes 2 constituting the core 3 is composed of a fitting body of a pair of plates 2a and 2b formed in a groove shape. And as shown in FIG. 1, the both ends have the bulging part 1 which bulged in the minor axis direction, and the many flat tubes 2 are laminated | stacked in the bulging part 1, and the core 3 is formed. Then, a pair of tanks 5 are fitted on both ends of the core 3. That is, the inner surface of the tank 5 aligned with the outer periphery of the core 3 is fitted therein.

ケーシング４は、図３及び図４に示すごとく、溝形に形成されたケーシング本体4aとその開口端を閉塞する端蓋4bとからなり、筒状に形成される。そのケーシング４の材質は、希少金属であるニッケルが比較的少なく、同様に希少金属であるモリブデンを含まないことにより比較的安価な一般のステンレス鋼（一例として、ＳＵＳ３０４）である。そのケーシング４の両端部内周は、タンク５の外周に整合し、それに被嵌される。そのケーシング本体4aには、図４に示すごとく入口パイプ7a、出口パイプ7bが取り付けられて、その入口パイプ7aから冷却水８が図２のごとく、ケーシング４内部に供給される。そして、それが図３のごとく偏平チューブ２外周を流通する。このとき、冷却水８は図１のごとくタンク５の端縁5aまで達し、それと、その近傍を冷却する。   As shown in FIGS. 3 and 4, the casing 4 includes a casing body 4 a formed in a groove shape and an end lid 4 b that closes the opening end thereof, and is formed in a cylindrical shape. The casing 4 is made of general stainless steel (for example, SUS304) which is relatively inexpensive because it contains relatively little nickel, which is a rare metal, and similarly does not contain molybdenum, which is a rare metal. The inner periphery of both ends of the casing 4 is aligned with the outer periphery of the tank 5 and is fitted on it. An inlet pipe 7a and an outlet pipe 7b are attached to the casing body 4a as shown in FIG. 4, and cooling water 8 is supplied from the inlet pipe 7a into the casing 4 as shown in FIG. And it distribute | circulates the flat tube 2 outer periphery like FIG. At this time, the cooling water 8 reaches the edge 5a of the tank 5 as shown in FIG. 1, and cools the vicinity thereof.

その端縁5aに隣接して、ケーシング４には絞り部６が設けられ、その絞り部６の端部によって、タンク５の端縁5aを位置決めする。そのケーシング本体4a、端蓋4bはそれぞれ溝形に形成されているため、その先端部外周に絞り部６をプレス成形するのは容易である。   Adjacent to the edge 5 a, the casing 4 is provided with a throttle portion 6, and the end 5 a of the tank 5 is positioned by the end of the throttle portion 6. Since the casing body 4a and the end lid 4b are each formed in a groove shape, it is easy to press-mold the throttle portion 6 on the outer periphery of the tip portion.

次に、タンク５及び偏平チューブ２には高温の排気ガス９が直接導かれるので、ニッケル成分をより多く含み、さらに希少金属であるモリブデンを含む高耐食性ステンレス鋼（一例として、ＳＵＳ８３６）で形成され、排気ガス９に対する耐熱・耐食性を確保している。そして、各部品の接触部間にはあらかじめろう材が塗布され、組立てられた状態で、全体を高温の炉内に挿入し、一体的にろう付け固定する。   Next, since the high-temperature exhaust gas 9 is directly led to the tank 5 and the flat tube 2, the tank 5 and the flat tube 2 are made of highly corrosion-resistant stainless steel (for example, SUS836) containing more nickel components and further containing rare metal molybdenum. The heat and corrosion resistance against the exhaust gas 9 is ensured. Then, a brazing material is applied in advance between the contact portions of the respective parts, and the whole is inserted into a high-temperature furnace in an assembled state, and integrally brazed and fixed.

そして、一方のタンク５から排気ガス９導き、各偏平チューブ２内にそれを流通させる。また、ケーシング４の入口パイプ7aから冷却水８を導き、偏平チューブ２の外周に流通させて、出口パイプ7bからそれを流出させ、排気ガス９と冷却水８との間に熱交換を行なうものである。このとき、冷却水８は図１のごとくケーシング４の先端部まで導かれ、タンク５の端縁5aに達する。そして、タンク５の端部を冷却し、ケーシング４の先端部が高温になるのを抑制する。   Then, exhaust gas 9 is guided from one tank 5 and is circulated in each flat tube 2. Further, the cooling water 8 is guided from the inlet pipe 7a of the casing 4 and is circulated around the outer periphery of the flat tube 2, and is discharged from the outlet pipe 7b, so that heat is exchanged between the exhaust gas 9 and the cooling water 8. It is. At this time, the cooling water 8 is guided to the tip of the casing 4 as shown in FIG. 1 and reaches the edge 5 a of the tank 5. And the edge part of the tank 5 is cooled and it suppresses that the front-end | tip part of the casing 4 becomes high temperature.

１ 膨出部
２ 偏平チューブ
2a プレート
2b プレート
３ コア
４ ケーシング
4a ケーシング本体
4b 端蓋
５ タンク
5a 端縁 1 bulge 2 flat tube
2a plate
2b Plate 3 Core 4 Casing
4a Casing body
4b End cover 5 Tank
5a edge

６ 絞り部
7a 入口パイプ
7b 出口パイプ
８ 冷却水
９ 排気ガス
12 ガス流路
13 冷却水流路 6 Aperture part
7a Inlet pipe
7b Outlet pipe 8 Cooling water 9 Exhaust gas
12 Gas flow path
13 Cooling water flow path

Claims (3)

両端開口部にその開口の短径方向へ膨出した膨出部(1)が設けられた複数の偏平チューブ(2)を有し、その膨出部(1)で各偏平チューブ(2)が前記短径方向に積層されてコア(3)を構成し、そのコア(3)の外周にケーシング(4)が被嵌され、そのケーシング(4)の端部に排気ガスのタンク(5)が接続され、それら各部品の接触部が互いにろう付け固定されて、
その排気ガスのタンク(5)を介して、各偏平チューブ(2)内に排気ガスが導かれると共に、ケーシング(4)内の冷却水が各偏平チューブ(2)の外周に導かれる排気熱交換器のケーシング接続構造において、
前記コア(3)の端部外周にタンク(5)の一端開口部を重ねて被嵌し、そのタンク(5)の一端開口部の外周にケーシング(4)の端部外周を重ねて被嵌し、そのタンク(5)の端縁(5a)がケーシング(4)内の冷却水に接するように構成し、
前記タンク(5)は高耐食性ステンレス鋼で形成し、前記ケーシング(4)は一般ステンレス鋼で形成したことを特徴とする排気熱交換器のケーシング接続構造。 It has a plurality of flat tubes (2) provided with a bulging portion (1) bulging in the minor axis direction of the opening at both ends of the opening, and each flat tube (2) is at the bulging portion (1). The core (3) is laminated in the minor axis direction, the casing (4) is fitted on the outer periphery of the core (3), and an exhaust gas tank (5) is provided at the end of the casing (4). Connected, the contact parts of these parts are brazed and fixed together,
Exhaust gas is introduced into each flat tube (2) through the exhaust gas tank (5), and the cooling water in the casing (4) is led to the outer periphery of each flat tube (2). In the casing connection structure of the vessel,
One end opening of the tank (5) is put on the outer periphery of the end of the core (3), and the outer periphery of the end of the casing (4) is put on the outer periphery of the one end opening of the tank (5). And the end edge (5a) of the tank (5) is configured to come into contact with the cooling water in the casing (4),
A casing connection structure for an exhaust heat exchanger, wherein the tank (5) is made of high corrosion resistance stainless steel, and the casing (4) is made of general stainless steel. 請求項１に記載のケーシング接続構造において、
前記偏平チューブ(2)は、高耐食性ステンレス鋼で形成され、その板厚が前記ケーシング(4)の板厚およびタンク(5)の板厚より薄く形成された排気熱交換器のケーシング接続構造。 The casing connection structure according to claim 1,
A casing connection structure for an exhaust heat exchanger, wherein the flat tube (2) is made of highly corrosion-resistant stainless steel, and the plate thickness thereof is thinner than the plate thickness of the casing (4) and the plate thickness of the tank (5). 請求項１または請求項２に記載のケーシング接続構造において、
前記ケーシング(4)の端部外周で、前記タンク(5)の端縁に隣接した位置にコア(3)側に凹陥した絞り部(6)が設けられ、その絞り部(6)の縁がタンク(5)の端縁(5a)に係止されて、両者が互いに位置決めされた排気熱交換器のケーシング接続構造。 In the casing connection structure according to claim 1 or 2,
On the outer periphery of the end of the casing (4), there is provided a throttle part (6) recessed in the core (3) side at a position adjacent to the edge of the tank (5), and the edge of the throttle part (6) A casing connection structure for an exhaust heat exchanger, which is locked to an edge (5a) of a tank (5) and positioned to each other.
JP2012230666A 2012-10-18 2012-10-18 Casing connection structure of exhaust heat exchanger Pending JP2014081175A (en)

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CN110686538A (en) * 2015-10-29 2020-01-14 株式会社T.Rad Structure of a headerless plate type heat exchanger core
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