JP2001099584A - Heat exchanger for exhaust gas - Google Patents

Heat exchanger for exhaust gas

Info

Publication number
JP2001099584A
JP2001099584A JP27618099A JP27618099A JP2001099584A JP 2001099584 A JP2001099584 A JP 2001099584A JP 27618099 A JP27618099 A JP 27618099A JP 27618099 A JP27618099 A JP 27618099A JP 2001099584 A JP2001099584 A JP 2001099584A
Authority
JP
Japan
Prior art keywords
exhaust gas
heat exchanger
inner fin
soot
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP27618099A
Other languages
Japanese (ja)
Other versions
JP4354586B2 (en
Inventor
Makoto Wada
誠 和田
Hisao Hagiwara
久雄 萩原
Masao Hanada
雅雄 花田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyo Radiator Co Ltd
Original Assignee
Toyo Radiator Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyo Radiator Co Ltd filed Critical Toyo Radiator Co Ltd
Priority to JP27618099A priority Critical patent/JP4354586B2/en
Publication of JP2001099584A publication Critical patent/JP2001099584A/en
Application granted granted Critical
Publication of JP4354586B2 publication Critical patent/JP4354586B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0062Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by spaced plates with inserted elements
    • F28D9/0075Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one heat-exchange medium being formed by spaced plates with inserted elements the plates having openings therein for circulation of the heat-exchange medium from one conduit to another
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001Recuperative heat exchangers
    • F28D21/0003Recuperative heat exchangers the heat being recuperated from exhaust gases
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28FDETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/025Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being corrugated, plate-like elements

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger for an exhaust gas capable of suppressing clogging to a lowest limit caused by an adherence of a soot or the like in exhaust gas to a condensed water. SOLUTION: The heat exchanger comprises an exhaust gas channel 1 and a cooling water channel 2 alternately arranged and inner fins 4 disposed at the gas channel 1. Thus, clogging of a soot or the like contained in an exhaust gas is prevented. In this case, only ends of the fins 4 are provided at a non- brazing part 5 at contact surfaces of the fins 4 with the plate 3, thereby preventing condensing of the part.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、インナーフィンを
有する多板型の排気ガス用熱交換器に係り、排気ガス中
のスス等が壁面に付着して目詰まりすることを防止する
ものに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-plate type exhaust gas heat exchanger having inner fins, which prevents soot and the like in exhaust gas from adhering to a wall surface and clogging.

【0002】[0002]

【従来の技術】EGRクーラ等に用いる排気ガス処理用
熱交換器は、その熱効率を向上させるため、排気ガス流
路と冷却水流路とをプレートを介して交互に配置し、排
気ガス流路には波形に曲折形成されたインナーフィンが
配置されていた。
2. Description of the Related Art An exhaust gas treatment heat exchanger used for an EGR cooler or the like has an exhaust gas flow path and a cooling water flow path alternately arranged via a plate in order to improve the thermal efficiency thereof. Has an inner fin bent in a waveform.

【0003】[0003]

【発明が解決しようとする課題】ところが、排気ガス中
に含まれるスス等が熱交換器の特にインナーフィンに付
着し、次第に目詰まりを起こして、熱交換性能を低下さ
せていた。この目詰まりを観察すると、それはインナー
フィンの排気ガス流入端から始まり、次第に奥にそれが
成長していた。この目詰まりがインナーフィンの先端か
ら生じる理由は、そこに渦流が生じ、それに凝縮水が捕
捉されて滞留し、その凝縮水に排気ガス中のスス等が付
着するからと思われる。そこで本発明は、このような目
詰まりを最低限に抑える排気ガス用熱交換器を提供する
ことを課題とする。
However, soot and the like contained in the exhaust gas adhere to the heat exchanger, particularly to the inner fins, and gradually cause clogging, thereby deteriorating the heat exchange performance. Observation of this clogging indicated that it began at the exhaust gas inflow end of the inner fin and gradually grew deeper into the inner fin. The reason why this clogging occurs from the tip of the inner fin is considered to be that a vortex is generated there, condensed water is trapped and stays there, and soot and the like in the exhaust gas adhere to the condensed water. Therefore, an object of the present invention is to provide an exhaust gas heat exchanger that minimizes such clogging.

【0004】[0004]

【課題を解決するための手段】本発明は、夫々偏平な排
気ガス流路1と冷却水流路2とがプレート3を介して交
互に配置され、稜線を排気ガス流通方向に位置して波型
のインナーフィン4が排気ガス流路1に配置された排気
ガス用熱交換器において、前記インナーフィン4の頂部
および谷部が、それに隣接する前記プレート3にろう付
けされると共に、そのインナーフィン4の排気ガス入口
側縁部には、結露防止用の非ろう付け部5が設けられた
ことを特徴とする排気ガス用熱交換器である。
According to the present invention, a flat exhaust gas passage 1 and a cooling water passage 2 are alternately arranged via a plate 3, and a ridge line is positioned in the exhaust gas flow direction to form a wave. In the exhaust gas heat exchanger in which the inner fins 4 are arranged in the exhaust gas passage 1, the tops and valleys of the inner fins 4 are brazed to the plate 3 adjacent thereto, and the inner fins 4 A non-brazing portion 5 for preventing dew condensation is provided at the edge of the exhaust gas inlet side of the exhaust gas heat exchanger.

【0005】[0005]

【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は本発明の排気ガス用熱
交換器の要部斜視図であり、図2は図1のII−II線縦断
面図であって、インナーフィン4の入口近傍における渦
流発生状態の説明図である。また、図3は同縦断面図で
あってインナーフィン4の内部の温度分布説明図であ
り、図4は本発明の排気ガス用熱交換器の一例を示す分
解斜視図である。図4に示す例の熱交換器は、比較的肉
厚のガス側プレート10と水側プレート11とを有し、それ
らが薄いプレート3を介して交互に配置され、ガス側プ
レート10の内部にはインナーフィン4が配置されたもの
である。薄いプレート3はその四隅部に一対づつの冷却
水連通孔8と排気ガス連通孔9が対角状に配置されてい
る。ガス側プレート10には、平面がやや菱形の排気ガス
流路1と、対角位置に一対の冷却水連通孔8とが形成さ
れている。水側プレート11には、対角位置に一対の排気
ガス連通孔9が配置され、それらの間に平面菱形の冷却
水流路2が設けられる。排気ガス流路1と冷却水流路2
とは、その平面菱形の向きが互いに逆に形成されてい
る。
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a main part of the exhaust gas heat exchanger of the present invention, and FIG. 2 is a vertical sectional view taken along the line II-II of FIG. It is. FIG. 3 is a longitudinal sectional view illustrating the temperature distribution inside the inner fin 4, and FIG. 4 is an exploded perspective view showing an example of the exhaust gas heat exchanger of the present invention. The heat exchanger of the example shown in FIG. 4 has a relatively thick gas side plate 10 and a water side plate 11, which are alternately arranged via the thin plate 3, and are provided inside the gas side plate 10. Denotes an arrangement of the inner fins 4. The thin plate 3 is provided with a pair of cooling water communication holes 8 and exhaust gas communication holes 9 diagonally arranged at four corners thereof. The gas side plate 10 is formed with an exhaust gas flow path 1 having a slightly rhombic flat surface and a pair of cooling water communication holes 8 at diagonal positions. A pair of exhaust gas communication holes 9 are arranged on the water side plate 11 at diagonal positions, and a plane rhombic cooling water flow path 2 is provided therebetween. Exhaust gas channel 1 and cooling water channel 2
Means that the directions of the planar rhombus are opposite to each other.

【0006】なお、互いに接合される各部品間には予め
ろう材がその外表面に被覆されたものを用い、或いはろ
う箔を配置して、それを溶融し次いで固化することによ
り各部品間が一体に接合される。このとき、インナーフ
ィン4とプレート3とのろう付け部は図1〜図3の如く
その先端において非ろう付け部5が形成され、それ以外
の部分がろう付け部12を形成する。この非ろう付け部5
の長さは、インナーフィン4の振幅高さによって夫々異
なるが、少なくとも1mm以上必要である。このように
してなる熱交換器の要部縦断面は、図2の如く排気ガス
流路1と冷却水流路2とがプレート3を介して交互に配
置され、排気ガス流路1にはインナーフィン4が収納さ
れる。インナーフィン4は、その稜線が排気ガスの流通
方向に位置した波形のものが用いられる。そして排気ガ
ス流路1に排気ガス6が図2の如く流通し、冷却水流路
2に冷却水7が図の如く流通する。なお、冷却水7の流
通方向は排気ガス6に対して逆向きであってもよい。
[0006] A brazing material whose outer surface is coated in advance with a brazing material is used between the parts to be joined together, or a brazing foil is arranged, and then melted and solidified to form a gap between the parts. Joined together. At this time, the brazing portion between the inner fin 4 and the plate 3 forms a non-brazing portion 5 at the tip as shown in FIGS. 1 to 3, and the other portions form a brazing portion 12. This non-brazing part 5
Is different depending on the amplitude height of the inner fin 4, but it is necessary to be at least 1 mm or more. The longitudinal section of the main part of the heat exchanger thus constructed is such that exhaust gas passages 1 and cooling water passages 2 are alternately arranged via plates 3 as shown in FIG. 4 are stored. The inner fin 4 has a waveform whose ridge line is located in the flow direction of the exhaust gas. The exhaust gas 6 flows through the exhaust gas flow path 1 as shown in FIG. 2, and the cooling water 7 flows through the cooling water flow path 2 as shown in FIG. Note that the flow direction of the cooling water 7 may be opposite to the exhaust gas 6.

【0007】排気ガス6が排気ガス流路1内を流通する
と、図2の如く、インナーフィン4の入口側部分におい
て特にその壁面に沿って渦流が生じる。なお、点線で示
された渦は幅方向に隣接するガス流路の状態を示す。従
来の熱交換器ではこの渦が生じる部分に凝縮水が滞留
し、そこに排気ガス中のスス等が付着し、それが次第に
下流側に成長する現象が生じていた。しかしながら、本
発明ではその渦流が生じる部分では、インナーフィン4
とプレート3は非ろう付け状態である。即ち、そこに非
ろう付け部5に形成され、その非ろう付け部5の下流側
にのみに、ろう付け部12が設けられている。それ故、冷
却水7による冷却効果が非ろう付け部5においては小さ
くなり、インナーフィン4の内部における温度分布は図
3の如くなる。なお、点線で示された温度分布曲線は幅
方向に隣接するガス流路の状態を示す。本発明では、非
ろう付け部5部分の冷却効果が小さいから、そこに結露
水が生じることがない。そのため、そこに渦流が発生し
ても結露水が生じないので、ススの付着がない。なお、
非ろう付け部5を越えた下流側においては凝縮水が生じ
る。しかし、そこには渦が生じ難いので、排気ガスの流
通に伴い、凝縮水は全て下流側に搬送される。その結
果、インナーフィン4の壁面に排気ガス6中のスス等が
付着することを可及的に防止する。
When the exhaust gas 6 circulates in the exhaust gas flow path 1, as shown in FIG. 2, a vortex occurs at the inlet side portion of the inner fin 4, particularly along the wall surface thereof. The vortex indicated by the dotted line indicates the state of the gas flow path adjacent in the width direction. In the conventional heat exchanger, the condensed water stays in the portion where the vortex is generated, soot and the like in the exhaust gas adhere thereto, and a phenomenon that the soot gradually grows downstream is generated. However, in the present invention, in the portion where the vortex is generated, the inner fin 4
And the plate 3 are not brazed. That is, the non-brazing portion 5 is formed therein, and the brazing portion 12 is provided only on the downstream side of the non-brazing portion 5. Therefore, the cooling effect of the cooling water 7 is reduced in the non-brazing portion 5, and the temperature distribution inside the inner fin 4 is as shown in FIG. In addition, the temperature distribution curve shown by the dotted line shows the state of the gas flow path adjacent in the width direction. In the present invention, since the cooling effect of the non-brazing portion 5 is small, dew condensation does not occur there. Therefore, even if a vortex is generated there, no dew water is generated, so that there is no adhesion of soot. In addition,
On the downstream side beyond the non-brazing portion 5, condensed water is generated. However, since a swirl hardly occurs there, the condensed water is all conveyed downstream with the flow of the exhaust gas. As a result, soot or the like in the exhaust gas 6 is prevented from adhering to the wall surface of the inner fin 4 as much as possible.

【0008】なお、上記実施の形態ではインナーフィン
4の横断面は、長手方向の各位置で全て同一に形成され
ているが、それに限らずいわゆるオフセット型のフィン
を用いることもできる。このオフセット型のインナーフ
ィンは、マルチエントリー型とも言われ、稜線の側面に
幅方向へ突出部が形成され、その突出部に開口が形成さ
れたものである。このようなオフセット型のフィンにお
いても、実験によれば排気ガス中のスス等の付着は主と
してインナーフィンの先端部から成長するので、その先
端部に非ろう付け部5を形成し、先端部の温度を高める
ことにより凝縮水の滞留を防止し、スス等の付着をなく
すことができる。
In the above embodiment, the cross section of the inner fin 4 is formed to be the same at each position in the longitudinal direction. However, the present invention is not limited thereto, and a so-called offset fin may be used. This offset type inner fin is also called a multi-entry type, and has a protrusion formed in the width direction on the side surface of the ridge line, and an opening formed in the protrusion. Even in such offset type fins, according to experiments, the adhesion of soot and the like in the exhaust gas mainly grows from the tip of the inner fin. By increasing the temperature, the accumulation of the condensed water can be prevented, and the adhesion of soot and the like can be eliminated.

【0009】[0009]

【発明の作用・効果】本発明の排気ガス用熱交換器は、
その排気ガス流路1に配置されたインナーフィン4の排
気ガス入口側縁部に結露防止用の非ろう付け部5が設け
られているので、排気ガス中のスス等がそこに付着する
ことを防止できる。そして結露をインナーフィン4の流
通方向のより奥側に位置させ、そこに生じた結露水を円
滑に排除し、結果として熱交換器全体の目詰まりを防止
できる。逆にいえば、インナーフィン4の排気ガス入口
側縁部では、特に渦流ができ易く、従来の熱交換器では
そこに結露水が滞留しがちである。しかしながら本発明
の熱交換器は、インナーフィン4の入口側縁部で、それ
とプレート3とがろう付けされていないため、インナー
フィン4の先端縁部は比較的高温となり、凝縮水が生じ
難い。従って、渦流の発生し易い部分があってもそこに
は凝縮水が滞留せず、排気ガス中のスス付着を防止でき
る。また、その入口側縁部から下流側では渦流が生じ難
いので、凝縮水が滞留することを防止し、凝縮水の滞留
に基づく排気ガスのスス等の壁面付着を防止できる。
The exhaust gas heat exchanger of the present invention
Since the non-brazing portion 5 for preventing dew condensation is provided at the edge of the inner fin 4 on the exhaust gas inlet side disposed in the exhaust gas flow path 1, soot and the like in the exhaust gas adhere thereto. Can be prevented. Then, the dew condensation is located on the farther side in the flow direction of the inner fin 4, and the dew condensation water generated there is smoothly removed, and as a result, clogging of the entire heat exchanger can be prevented. Conversely, swirling is particularly likely to occur at the edge of the inner fin 4 on the exhaust gas inlet side, and condensed water tends to stay there in the conventional heat exchanger. However, in the heat exchanger of the present invention, since the plate 3 is not brazed to the edge of the inner fin 4 on the inlet side, the tip edge of the inner fin 4 has a relatively high temperature, and condensed water hardly occurs. Therefore, even if there is a portion where a vortex is likely to occur, condensed water does not stay there, and soot deposition in the exhaust gas can be prevented. In addition, since a vortex is unlikely to occur on the downstream side from the inlet side edge, it is possible to prevent the condensed water from staying, and to prevent the exhaust gas from adhering to the wall surface such as soot due to the staying of the condensed water.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の排気ガス用熱交換器の要部斜視図。FIG. 1 is a perspective view of a main part of an exhaust gas heat exchanger of the present invention.

【図2】同熱交換器の縦断面図であって、インナーフィ
ン4の入口近傍における渦流発生状態の説明図。
FIG. 2 is a vertical cross-sectional view of the heat exchanger, illustrating a state in which a vortex is generated near an inlet of an inner fin 4;

【図3】同熱交換器の縦断面図であって、インナーフィ
ン4の内部の温度分布説明図。
FIG. 3 is a vertical cross-sectional view of the heat exchanger, illustrating temperature distribution inside an inner fin 4.

【図4】本発明の排気ガス用熱交換器の一例を示す分解
斜視図。
FIG. 4 is an exploded perspective view showing an example of the exhaust gas heat exchanger of the present invention.

【符号の説明】[Explanation of symbols]

1 排気ガス流路 2 冷却水流路 3 プレート 4 インナーフィン 5 非ろう付け部 6 排気ガス 7 冷却水 8 冷却水連通孔 9 排気ガス連通孔 10 ガス側プレート 11 水側プレート 12 ろう付け部 DESCRIPTION OF SYMBOLS 1 Exhaust gas flow path 2 Cooling water flow path 3 Plate 4 Inner fin 5 Non-brazing part 6 Exhaust gas 7 Cooling water 8 Cooling water communication hole 9 Exhaust gas communication hole 10 Gas side plate 11 Water side plate 12 Brazing part

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 夫々偏平な排気ガス流路1と冷却水流路
2とがプレート3を介して交互に配置され、稜線を排気
ガス流通方向に位置して波型のインナーフィン4が排気
ガス流路1に配置された排気ガス用熱交換器において、 前記インナーフィン4の頂部および谷部が、それに隣接
する前記プレート3にろう付けされると共に、そのイン
ナーフィン4の排気ガス入口側縁部には、結露防止用の
非ろう付け部5が設けられたことを特徴とする排気ガス
用熱交換器。
1. A flat exhaust gas flow path 1 and a cooling water flow path 2 are alternately arranged via a plate 3, and a ridge line is located in an exhaust gas flow direction, and a corrugated inner fin 4 is provided. In the exhaust gas heat exchanger arranged in the path 1, the top and the valley of the inner fin 4 are brazed to the plate 3 adjacent thereto, and the inner fin 4 is attached to the edge of the inner fin 4 on the exhaust gas inlet side. Is a heat exchanger for exhaust gas, wherein a non-brazing part 5 for preventing dew condensation is provided.
JP27618099A 1999-09-29 1999-09-29 Exhaust gas heat exchanger Expired - Fee Related JP4354586B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27618099A JP4354586B2 (en) 1999-09-29 1999-09-29 Exhaust gas heat exchanger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27618099A JP4354586B2 (en) 1999-09-29 1999-09-29 Exhaust gas heat exchanger

Publications (2)

Publication Number Publication Date
JP2001099584A true JP2001099584A (en) 2001-04-13
JP4354586B2 JP4354586B2 (en) 2009-10-28

Family

ID=17565840

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27618099A Expired - Fee Related JP4354586B2 (en) 1999-09-29 1999-09-29 Exhaust gas heat exchanger

Country Status (1)

Country Link
JP (1) JP4354586B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006010130A (en) * 2004-06-23 2006-01-12 T Rad Co Ltd Multi-fluid heat exchanger
CN100445522C (en) * 2004-08-25 2008-12-24 圣戈班欧洲设计研究中心 Filtering block with fins for filtering particles contained in an internal combustion engine exhaust gases
JP2010144979A (en) * 2008-12-17 2010-07-01 Denso Corp Heat exchanger
WO2014021026A1 (en) * 2012-08-01 2014-02-06 カルソニックカンセイ株式会社 Heat exchanger

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