JPH0988730A - Egr gas cooling system - Google Patents
Egr gas cooling systemInfo
- Publication number
- JPH0988730A JPH0988730A JP7267692A JP26769295A JPH0988730A JP H0988730 A JPH0988730 A JP H0988730A JP 7267692 A JP7267692 A JP 7267692A JP 26769295 A JP26769295 A JP 26769295A JP H0988730 A JPH0988730 A JP H0988730A
- Authority
- JP
- Japan
- Prior art keywords
- egr
- pipe
- cooling
- gas
- egr gas
- 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
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 60
- 239000000498 cooling water Substances 0.000 claims abstract description 13
- 230000002093 peripheral effect Effects 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 239000000446 fuel Substances 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 45
- 239000000112 cooling gas Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 239000000110 cooling liquid Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000005219 brazing Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
- F28D7/024—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はＥＧＲガス冷却装
置、特に、排気系から排気ガスの一部を取出し、ＥＧＲ
配管を介してエンジンの吸気口に戻し、混合気に加える
排気再循環（以下ＥＧＲという）に際して、ＥＧＲ配管
内のＥＧＲガスを冷却するＥＧＲガス冷却装置に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an EGR gas cooling device, and more particularly, to extracting a part of exhaust gas from an exhaust system,
The present invention relates to an EGR gas cooling device that cools EGR gas in an EGR pipe when returning to an intake port of an engine through a pipe and recirculating exhaust gas (hereinafter referred to as EGR) added to an air-fuel mixture.
【０００２】[0002]
【従来の技術】排気系から排気ガスの一部を取出し、Ｅ
ＧＲ配管を介してエンジンの吸気口に戻し、混合気に加
えるＥＧＲが行われている。このＥＧＲを行うと、燃焼
混合気中の窒素ガス、炭酸ガスなどの不活性ガスの割合
が増加するために、燃焼温度が低下しＮＯｘの発生を抑
えることが可能になる。さらに適量のＥＧＲを行うこと
により、ポンプ損失の低減と燃焼ガスの温度低下によ
り、冷却液への放熱損失が低減し、作動ガス量及び組成
の変化により、比熱比の増大によるサイクル効率が向上
する。しかし、ＥＧＲに際して、ＥＧＲガスの温度が高
すぎると、ＥＧＲガスの体積が増加して冷えた外気（吸
気）量を増せず、したがって吸気温度が低下しないため
燃費が悪くなるとともに、ＥＧＲ配管のバルブの耐久性
を劣化させ、バルブを破損することがあるため、ＥＧＲ
配管内のＥＧＲガスを、特にＥＧＲ率を高めた場合等に
は適度に冷却することが必要である。2. Description of the Related Art Extracting a part of exhaust gas from an exhaust system,
EGR is carried out by returning to the intake port of the engine through the GR pipe and adding to the air-fuel mixture. When this EGR is performed, the proportion of the inert gas such as nitrogen gas and carbon dioxide gas in the combustion mixture increases, so that the combustion temperature decreases and the generation of NOx can be suppressed. Further, by performing an appropriate amount of EGR, the heat loss to the cooling liquid is reduced due to the reduction of the pump loss and the temperature decrease of the combustion gas, and the cycle efficiency due to the increase of the specific heat ratio is improved by the change of the working gas amount and composition . However, at the time of EGR, if the temperature of the EGR gas is too high, the volume of the EGR gas increases and the amount of cooled outside air (intake air) cannot be increased. EGR may deteriorate the durability and damage the valve.
It is necessary to appropriately cool the EGR gas in the pipe, especially when the EGR rate is increased.
【０００３】[0003]
【発明が解決しようとする課題】このＥＧＲ配管内のＥ
ＧＲガスの冷却のために、従来は、例えば、実公昭５７
−３０９号公報に開示されているように、ＥＧＲ配管を
多管伝熱管構造にし、この多管伝熱管にエンジンの冷却
水を接触流動させる多管式熱交換器を車両に搭載し、こ
の多管式熱交換器によって、多管伝熱管内のＥＧＲガス
を冷却していた。しかし、この多管式熱交換器は、構造
が複雑で製造コスト上で問題があり、また装置が大型化
し車載重量が増大するという面でも問題がある。E in this EGR pipe
For cooling the GR gas, the conventional method is, for example, Jpn.
As disclosed in Japanese Patent Publication No. 309-309, the EGR pipe has a multi-tube heat transfer tube structure, and a multi-tube heat exchanger that causes the engine cooling water to flow in contact with the multi-tube heat transfer tube is mounted on a vehicle. The EGR gas in the multi-tube heat transfer tube was cooled by the tube heat exchanger. However, this multitubular heat exchanger has a problem in terms of manufacturing cost due to its complicated structure, and also has a problem in that the size of the device is increased and the weight of the vehicle is increased.
【０００４】本発明は、前述したようなこの種のＥＧＲ
ガス冷却の現状に鑑みてなされたものであり、その目的
は、構造が簡単で低製造コストで製造でき、また燃費を
向上させるためＥＧＲガスを効率的に冷却するＥＧＲガ
ス冷却装置を提供することにある。The present invention is based on this type of EGR as described above.
The present invention has been made in view of the current state of gas cooling, and an object thereof is to provide an EGR gas cooling device that is simple in structure, can be manufactured at low manufacturing cost, and efficiently cools EGR gas to improve fuel efficiency. It is in.
【０００５】[0005]
【課題を解決するための手段】前記目的を達成するため
に、本発明は、排気系から排気ガスの一部を取出し、Ｅ
ＧＲ配管を介してエンジンの吸気口に戻し、混合気に加
える排気再循環に際して、前記ＥＧＲ配管内のＥＧＲガ
スを冷却するＥＧＲガス冷却装置であって、前記ＥＧＲ
配管の外周面に、エンジン冷却用の冷却水が流される冷
却配管が、スパイラル状に対接巻装されていることを特
徴とするものである。In order to achieve the above-mentioned object, the present invention extracts a part of exhaust gas from an exhaust system,
An EGR gas cooling device that cools the EGR gas in the EGR pipe during exhaust gas recirculation returning to the intake port of the engine via the GR pipe and adding to the air-fuel mixture,
A cooling pipe for flowing cooling water for engine cooling is spirally wound around the outer peripheral surface of the pipe in a spiral shape.
【０００６】また本発明においては、前記ＥＧＲ配管の
外周面に、スパイラル状に凹溝が形成され、前記冷却配
管が前記凹溝に嵌合して、前記ＥＧＲ配管に対接巻装さ
れていることが好ましい。Further, in the present invention, a spiral groove is formed on the outer peripheral surface of the EGR pipe, and the cooling pipe is fitted in the groove and wound around the EGR pipe in a face-to-face relationship. It is preferable.
【０００７】さらに本発明では、前記冷却配管の前記Ｅ
ＧＲ配管の対接部が、平面状に形成されていることが好
ましい。Further, in the present invention, the E of the cooling pipe is
The contact portion of the GR pipe is preferably formed in a flat shape.
【０００８】さらにまた本発明においては、前記冷却配
管が、長手方向において互いに対向する外壁面が平面状
である扁平管に形成されていることが好ましい。Furthermore, in the present invention, it is preferable that the cooling pipe is formed as a flat pipe whose outer wall surfaces facing each other in the longitudinal direction are flat.
【０００９】[0009]
【発明の実施の形態】本発明を、図１を参照して説明す
る。図１は本発明の一実施例の要部の構成を示す説明図
である。DETAILED DESCRIPTION OF THE INVENTION The present invention will be described with reference to FIG. FIG. 1 is an explanatory diagram showing a configuration of a main part of one embodiment of the present invention.
【００１０】本発明に使用される車両にはＥＧＲが設け
られ、図１に示すように、一端側を車両の排気系の排気
口に位置させ、他端側を車両のエンジンの吸気口に位置
させ、排気系から排出されるＥＧＲガスの一部Ｅを取出
して、エンジンの吸気口に戻すＥＧＲ配管１が配設され
ている。このＥＧＲ配管１の外周面には、エンジンの冷
却水Ｗが流される冷却配管２がスパイラル状に巻装さ
れ、この冷却配管２はろう付けまたは溶接の手段によっ
て、ＥＧＲ配管１に密着・固定されている。このＥＧＲ
配管１の管径はエンジン排気量とＥＧＲ率によって決ま
るが、冷却配管２の管径及び巻装ピッチは、エンジンの
吸気口に戻されるＥＧＲガスを、あらゆる運転条件下に
おいて予め設定した所定の温度に冷却するように選択さ
れている。The vehicle used in the present invention is provided with an EGR. As shown in FIG. 1, one end is located at the exhaust port of the exhaust system of the vehicle and the other end is located at the intake port of the vehicle engine. An EGR pipe 1 is provided for extracting a part E of the EGR gas discharged from the exhaust system and returning it to the intake port of the engine. On the outer peripheral surface of the EGR pipe 1, a cooling pipe 2 through which engine cooling water W is flowed is spirally wound, and the cooling pipe 2 is brought into close contact with and fixed to the EGR pipe 1 by means of brazing or welding. ing. This EGR
The pipe diameter of the pipe 1 is determined by the engine displacement and the EGR rate, but the pipe diameter and the winding pitch of the cooling pipe 2 are such that the EGR gas returned to the intake port of the engine has a predetermined temperature set under all operating conditions. It is selected to cool down.
【００１１】このような構成の本発明では、排気系から
排出される排気ガスの一部ＥがＥＧＲ配管１の一端か
ら、ＥＧＲ配管１内に取込まれ、ＥＧＲ配管１を介し
て、エンジンの吸気口に送られ、混合気に加えられてＥ
ＧＲが行われる。この場合にＥＧＲ配管１により、エン
ジンの吸気口に送られるＥＧＲガスの流量、すなわちＥ
ＧＲ率は、目的とするＮＯｘレベルとエンジンの安定性
とが満足する範囲内に、予め設定され制御されている。
このようにして、ＥＧＲを行うことにより、エンジンの
燃焼混合気中の窒素ガス、炭酸ガスなどの不活性ガスの
割合が増加するために、燃焼温度が低下してＮＯｘの発
生が抑えられる。また、適量のＥＧＲを行うことによ
り、ポンプ損失が低減し、燃焼ガスの温度が低下するた
めに、冷却液への放熱損失が低減し、作動ガス量及び組
成の変化によって、比熱比が増大してサイクル効率が向
上する。In the present invention having such a configuration, a part E of the exhaust gas discharged from the exhaust system is taken into the EGR pipe 1 from one end of the EGR pipe 1, and the engine E is discharged through the EGR pipe 1. E is sent to the intake port and added to the mixture
GR is performed. In this case, the EGR pipe 1 causes the flow rate of the EGR gas sent to the intake port of the engine, that is, E
The GR rate is preset and controlled within a range in which a desired NOx level and engine stability are satisfied.
By performing the EGR in this manner, the proportion of inert gas such as nitrogen gas and carbon dioxide gas in the combustion mixture of the engine is increased, so that the combustion temperature is lowered and the generation of NOx is suppressed. Further, by performing an appropriate amount of EGR, the pump loss is reduced and the temperature of the combustion gas is lowered, so the heat radiation loss to the cooling liquid is reduced, and the specific heat ratio is increased due to changes in the working gas amount and composition. Cycle efficiency is improved.
【００１２】この場合、本発明によると、ＥＧＲ配管１
内のＥＧＲガスが、冷却配管２内のエンジンの冷却水に
よって、最適のＥＧＲを実施するために最適の温度に冷
却されるので、ＥＧＲガスの体積が減少して冷えた外気
量を増すことができ、したがって吸気温度が低下して燃
費が向上するとともに、ＥＧＲガスの温度が高すぎるた
めに発生するＥＧＲ配管１のバルブの耐久性の劣化やバ
ルブの破損は発生せず、また、ＥＧＲガスの温度が低過
ぎるために発生する腐食性の強い水分が凝縮したり、デ
ポジットが付着して通路を腐食することもない。In this case, according to the present invention, the EGR pipe 1
Since the EGR gas in the inside is cooled to the optimum temperature by the cooling water of the engine in the cooling pipe 2 for performing the optimum EGR, the volume of the EGR gas can be decreased and the amount of cooled outside air can be increased. Therefore, the intake air temperature is lowered and the fuel consumption is improved, and the deterioration of the durability of the valve of the EGR pipe 1 and the damage of the valve that occur due to the temperature of the EGR gas being too high do not occur. It does not condense highly corrosive water that is generated because the temperature is too low, nor does the deposit adhere to corrode the passage.
【００１３】このように、本実施例によると、排気系か
ら排出される排気ガスの一部Ｅを取出して、エンジンの
吸気口に戻すＥＧＲ配管１の外周面に、エンジンの冷却
水が流される冷却配管２をスパイラル状に巻装固定する
簡単な構成により、別途複雑な多管式熱交換器の組込が
不要となり、製造コストを低減させることができ、最適
の温度のＥＧＲガスによるＥＧＲを実行して、ＥＧＲ配
管１のバルブの耐久性の劣化やバルブの破損なしに、Ｎ
Ｏｘの発生を抑えるとともに、燃費を向上することが可
能になり、また、比熱比の増大によりサイクル効率を向
上させることも可能になる。As described above, according to this embodiment, the cooling water of the engine is flown to the outer peripheral surface of the EGR pipe 1 which takes out a part E of the exhaust gas discharged from the exhaust system and returns it to the intake port of the engine. Due to the simple configuration of winding and fixing the cooling pipe 2 in a spiral shape, it is not necessary to incorporate a complicated multi-tubular heat exchanger separately, the manufacturing cost can be reduced, and EGR by EGR gas at an optimum temperature can be achieved. Execute the NGR without deterioration of the durability of the valve of the EGR pipe 1 or damage of the valve.
It is possible to suppress the generation of Ox and improve fuel efficiency, and it is also possible to improve cycle efficiency by increasing the specific heat ratio.
【００１４】次に本発明の他の実施例を、図２を参照し
て説明する。図２は本実施例の要部の構成を示す説明図
である。Next, another embodiment of the present invention will be described with reference to FIG. FIG. 2 is an explanatory diagram showing the configuration of the main part of this embodiment.
【００１５】本実施例では、図２に示すように、ＥＧＲ
配管１の外周面に、スパイラル状に凹溝１ａが形成さ
れ、冷却配管２がこの凹溝１ａ内に一部嵌合して、ＥＧ
Ｒ配管１に対接巻装され、該冷却配管２とＥＧＲ配管１
は好ましくはろう付けまたは溶接されている。In this embodiment, as shown in FIG.
A spiral groove 1a is formed on the outer peripheral surface of the pipe 1, and the cooling pipe 2 is partially fitted in the groove 1a,
The cooling pipe 2 and the EGR pipe 1 are wound so as to face each other around the R pipe 1.
Are preferably brazed or welded.
【００１６】このように構成することにより、冷却配管
２が、ＥＧＲ配管１の凹溝１ａと広い接触面積で接触し
た状態でＥＧＲ配管１に巻装され、かつ該ＥＧＲ配管１
のスパイラル状の凹溝１ａによって内部を流れるエンジ
ンの冷却水が乱流となって撹拌された状態にあるため、
ＥＧＲ配管１内のＥＧＲガスの冷却効率を向上させるこ
とが可能になる。With this structure, the cooling pipe 2 is wound around the EGR pipe 1 in a state of being in contact with the concave groove 1a of the EGR pipe 1 in a wide contact area, and the EGR pipe 1
Due to the spiral groove 1a, the engine cooling water flowing inside becomes a turbulent flow and is agitated.
It becomes possible to improve the cooling efficiency of the EGR gas in the EGR pipe 1.
【００１７】また本発明のさらに他の実施例を、図３を
参照して説明する。図３は本実施例の要部の構成を示す
説明図である。Still another embodiment of the present invention will be described with reference to FIG. FIG. 3 is an explanatory diagram showing the configuration of the main part of this embodiment.
【００１８】本実施例では、図３に示すように、冷却配
管２Ａには長手方向に、ＥＧＲ配管１との対接部に対し
て平面３が形成され、したがって冷却配管２Ａは全体と
して断面ほぼ三角形状を呈して、該冷却配管２Ａの前記
平面３をＥＧＲ配管１に対接させた状態で、ＥＧＲ配管
１に巻装され、該冷却配管２とＥＧＲ配管１はろう付け
または溶接されている。In this embodiment, as shown in FIG. 3, a flat surface 3 is formed in the cooling pipe 2A in the longitudinal direction with respect to the contact portion with the EGR pipe 1. Therefore, the cooling pipe 2A as a whole has a substantially cross section. The cooling pipe 2A is wound around the EGR pipe 1 in a state where the flat surface 3 of the cooling pipe 2A is in contact with the EGR pipe 1, and the cooling pipe 2 and the EGR pipe 1 are brazed or welded. .
【００１９】この実施例でも、冷却配管２Ａが、平面３
によってＥＧＲ配管１と広い接触面積で接触した状態
で、ＥＧＲ配管１に巻装されているので、ＥＧＲ配管１
内のＥＧＲガスの冷却効率を向上させることが可能にな
る。Also in this embodiment, the cooling pipe 2A has the flat surface 3
The EGR pipe 1 is wound around the EGR pipe 1 in a state of being in contact with the EGR pipe 1 with a large contact area.
It becomes possible to improve the cooling efficiency of the EGR gas inside.
【００２０】さらに本発明のさらに別の実施例を、図４
を参照して説明する。図４は本実施例の要部の構成を示
す説明図である。Still another embodiment of the present invention is shown in FIG.
This will be described with reference to FIG. FIG. 4 is an explanatory diagram showing the configuration of the main part of this embodiment.
【００２１】この実施例では、図４に示すように、冷却
配管２Ｂが、長手方向において互いに対向する外壁面４
が平面状で、全体として断面楕円形状の扁平管として形
成され、好ましくはＥＧＲ配管１の外周面に形成された
スパイラル状に凹溝１ｂ内に嵌合し、また該冷却配管２
とＥＧＲ配管１はろう付けまたは溶接されている。In this embodiment, as shown in FIG. 4, the cooling pipes 2B have outer wall surfaces 4 facing each other in the longitudinal direction.
Is formed as a flat tube having a planar shape and an elliptical cross section as a whole, and preferably fits in the groove 1b in a spiral shape formed on the outer peripheral surface of the EGR pipe 1, and the cooling pipe 2
The EGR pipe 1 is brazed or welded.
【００２２】そしてこの実施例でも、冷却配管２Ｂが、
長手方向において互いに対向する外壁面４が平面状であ
る扁平管に形成され、平面状の外壁面４によってＥＧＲ
配管１と広い接触面積で接触した状態で、ＥＧＲ配管１
に巻装され、、かつ該ＥＧＲ配管１のスパイラル状の凹
溝１ｂによって内部を流れるエンジンの冷却水が乱流と
なって撹拌された状態にあるため、ＥＧＲ配管１内のＥ
ＧＲガスの冷却効率を向上させるとともに、冷却配管２
Ｂを巻装してもＥＧＲ配管１の外径を全体として大型化
することが防止できる。Also in this embodiment, the cooling pipe 2B is
The outer wall surfaces 4 facing each other in the longitudinal direction are formed into a flat tube having a flat shape, and the flat outer wall surface 4 allows the EGR to be performed.
EGR pipe 1 with a large contact area with pipe 1
Since the engine cooling water flowing inside the EGR pipe 1 is turbulent and agitated by the spiral groove 1b of the EGR pipe 1, the EGR pipe 1
Cooling pipe 2 while improving the cooling efficiency of GR gas
Even if B is wound, it is possible to prevent the outer diameter of the EGR pipe 1 from being increased as a whole.
【００２３】[0023]
【発明の効果】以上説明した通り本発明によると、排気
系から排気ガスの一部を取出し、ＥＧＲ配管を介してエ
ンジンの吸気口に戻し、混合気に加える排気再循環を行
う場合、ＥＧＲ配管の外周面に、エンジン冷却用の冷却
水が流される冷却配管が、スパイラル状に対接巻装さ
れ、冷却配管の冷却水によって、ＥＧＲ配管内のＥＧＲ
ガスが冷却されるので、複雑で大型の熱交換器の構成が
不要となり、製造コストを削減し、車載重量を低減し
て、ＥＧＲガスを効率的に冷却することが可能になる。
また本発明によると、ＥＧＲ配管の外周面に、スパイラ
ル状に凹溝が形成され、冷却配管が凹溝に嵌合して、Ｅ
ＧＲ配管に対接巻装されているので、冷却配管とＥＧＲ
配管との対接面積が増加するとともに、冷却配管内部に
乱流を発生させてエンジンの冷却水を撹拌するため、冷
却効果を一層向上させることが可能になる。さらに本発
明によると、冷却配管のＥＧＲ配管の対接部が、平面状
に形成されているか、あるいは冷却配管が長手方向にお
いて互いに対向する外壁面が平面である扁平管に形成さ
れているので、冷却配管とＥＧＲ配管との対接面積が増
加し、さらに偏平管をＥＧＲ配管の外周面に形成したス
パイラル状の凹溝に嵌合すると、前記同様な撹拌効果に
より冷却効果を一層向上させるとともに、冷却配管を設
けたことによるＥＧＲ配管の外径の増大を防止できる。As described above, according to the present invention, when a part of the exhaust gas is taken out from the exhaust system, returned to the intake port of the engine through the EGR pipe, and exhaust gas recirculation for adding the air-fuel mixture is performed, the EGR pipe is used. A cooling pipe through which cooling water for engine cooling flows is spirally wound around the outer peripheral surface of the engine, and the cooling water in the cooling pipe causes the EGR pipe inside the EGR pipe to cool.
Since the gas is cooled, the structure of a complicated and large heat exchanger is not required, the manufacturing cost can be reduced, the vehicle weight can be reduced, and the EGR gas can be efficiently cooled.
Further, according to the present invention, a spiral groove is formed on the outer peripheral surface of the EGR pipe, and the cooling pipe is fitted into the groove, and E
Since it is wound in contact with the GR pipe, the cooling pipe and EGR
Since the contact area with the pipe increases and turbulent flow is generated inside the cooling pipe to stir the engine cooling water, the cooling effect can be further improved. Further, according to the present invention, the contact portion of the EGR pipe of the cooling pipe is formed in a flat shape, or the cooling pipe is formed in a flat pipe whose outer wall surfaces facing each other in the longitudinal direction are flat surfaces. When the contact area between the cooling pipe and the EGR pipe is increased, and the flat pipe is further fitted into the spiral groove formed on the outer peripheral surface of the EGR pipe, the cooling effect is further improved by the stirring effect similar to the above, and It is possible to prevent the outer diameter of the EGR pipe from increasing due to the provision of the cooling pipe.
【図１】本発明の要部の構成を示す説明図である。FIG. 1 is an explanatory diagram showing a configuration of a main part of the present invention.
【図２】本発明の他の実施例の要部の構成を示す説明図
である。FIG. 2 is an explanatory diagram showing a configuration of a main part of another embodiment of the present invention.
【図３】本発明のさらに他の実施例の要部の構成を示す
説明図である。FIG. 3 is an explanatory diagram showing a configuration of a main part of still another embodiment of the present invention.
【図４】本発明のさらに別の実施例の要部の構成を示す
説明図である。FIG. 4 is an explanatory diagram showing a configuration of a main part of still another embodiment of the present invention.
１ ＥＧＲ配管 ２、２Ａ、２Ｂ 冷却配管 ３ 平面 ４ 外壁面 1 EGR pipe 2, 2A, 2B cooling pipe 3 plane 4 outer wall surface
Claims (4)
ＧＲ戻し管を介してエンジンの吸気口に戻し、混合気に
加える排気再循環に際して、前記ＥＧＲ配管内のＥＧＲ
ガスを冷却するＥＧＲガス冷却装置であって、前記ＥＧ
Ｒ配管の外周面に、エンジン冷却用の冷却水が流される
冷却配管が、スパイラル状に対接巻装されていることを
特徴とするＥＧＲガス冷却装置。1. Extracting a part of exhaust gas from an exhaust system,
When the exhaust gas is recirculated to the intake port of the engine through the GR return pipe and added to the air-fuel mixture, the EGR in the EGR pipe is
An EGR gas cooling device for cooling gas, comprising:
An EGR gas cooling device characterized in that a cooling pipe for flowing cooling water for engine cooling is spirally wound around the outer peripheral surface of the R pipe in a spiral shape.
状に凹溝が形成され、前記冷却配管が前記凹溝に嵌合さ
れて、前記ＥＧＲ配管に対接巻装されていることを特徴
とする請求項１記載のＥＧＲガス冷却装置。2. A spiral groove is formed on an outer peripheral surface of the EGR pipe, the cooling pipe is fitted in the groove and is wound in a face-to-face relationship with the EGR pipe. The EGR gas cooling device according to claim 1.
が、平面状に形成されていることを特徴とする請求項１
記載のＥＧＲガス冷却装置。3. The facing portion of the EGR pipe of the cooling pipe is formed in a planar shape.
The EGR gas cooling device described.
に対向する外壁面が平面状である扁平管に形成されてい
ることを特徴とする請求項１記載のＥＧＲガス冷却装
置。4. The EGR gas cooling device according to claim 1, wherein the cooling pipe is formed as a flat pipe whose outer wall surfaces facing each other in the longitudinal direction are flat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26769295A JP3664457B2 (en) | 1995-09-21 | 1995-09-21 | EGR gas cooling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26769295A JP3664457B2 (en) | 1995-09-21 | 1995-09-21 | EGR gas cooling device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0988730A true JPH0988730A (en) | 1997-03-31 |
| JP3664457B2 JP3664457B2 (en) | 2005-06-29 |
Family
ID=17448216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26769295A Expired - Fee Related JP3664457B2 (en) | 1995-09-21 | 1995-09-21 | EGR gas cooling device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3664457B2 (en) |
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| US8069905B2 (en) | 2003-06-11 | 2011-12-06 | Usui Kokusai Sangyo Kaisha Limited | EGR gas cooling device |
| JP2013024425A (en) * | 2011-07-14 | 2013-02-04 | Electric Power Dev Co Ltd | Burner |
| GB2502247A (en) * | 2012-01-17 | 2013-11-27 | Malcolm Hunter | Heat recovery device |
| EP1895257A4 (en) * | 2005-05-16 | 2014-01-22 | Daikin Ind Ltd | HEAT EXCHANGER |
| EP1895256A4 (en) * | 2005-05-16 | 2014-01-22 | Daikin Ind Ltd | HEAT EXCHANGER |
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| CN108518865A (en) * | 2018-04-02 | 2018-09-11 | 瀚莎热力科技有限公司 | A kind of condensing gas wall hanging stove heat exchanger |
| CN114433878A (en) * | 2022-01-17 | 2022-05-06 | 成都飞机工业（集团）有限责任公司 | Pipeline with inner fluid channel and machining method thereof |
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| DE102010051664A1 (en) * | 2010-11-17 | 2012-05-24 | Liebherr-Hydraulikbagger Gmbh | implement |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8069905B2 (en) | 2003-06-11 | 2011-12-06 | Usui Kokusai Sangyo Kaisha Limited | EGR gas cooling device |
| EP1895257A4 (en) * | 2005-05-16 | 2014-01-22 | Daikin Ind Ltd | HEAT EXCHANGER |
| EP1895256A4 (en) * | 2005-05-16 | 2014-01-22 | Daikin Ind Ltd | HEAT EXCHANGER |
| JP2013024425A (en) * | 2011-07-14 | 2013-02-04 | Electric Power Dev Co Ltd | Burner |
| GB2502247A (en) * | 2012-01-17 | 2013-11-27 | Malcolm Hunter | Heat recovery device |
| JP2016083770A (en) * | 2016-02-01 | 2016-05-19 | 住友化学株式会社 | Cutting method and cutting device, manufacturing method for optical member |
| CN108518865A (en) * | 2018-04-02 | 2018-09-11 | 瀚莎热力科技有限公司 | A kind of condensing gas wall hanging stove heat exchanger |
| CN114433878A (en) * | 2022-01-17 | 2022-05-06 | 成都飞机工业（集团）有限责任公司 | Pipeline with inner fluid channel and machining method thereof |
| CN120331957A (en) * | 2025-04-23 | 2025-07-18 | 圣奇科技股份有限公司 | A scalding-proof heat dissipation device for a methanol generator set |
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| Publication number | Publication date |
|---|---|
| JP3664457B2 (en) | 2005-06-29 |
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