JP3664457B2 - EGR gas cooling device - Google Patents

EGR gas cooling device Download PDF

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Publication number
JP3664457B2
JP3664457B2 JP26769295A JP26769295A JP3664457B2 JP 3664457 B2 JP3664457 B2 JP 3664457B2 JP 26769295 A JP26769295 A JP 26769295A JP 26769295 A JP26769295 A JP 26769295A JP 3664457 B2 JP3664457 B2 JP 3664457B2
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Prior art keywords
egr
pipe
cooling
gas
egr gas
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JPH0988730A (en
Inventor
正佳 臼井
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Usui Co Ltd
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Usui Co Ltd
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    • 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

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  • 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)

Description

【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。
【０００２】
【従来の技術】
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。
【０００３】
【発明が解決しようとする課題】
このＥＧＲ配管内のＥＧＲ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。
また、ＥＧＲガス配管の外周に冷却水が循環するパイプが巻付けられたＥＧＲガスの冷却手段が知られているが、ＥＧＲガス配管内のＥＧＲガスの冷却効率が低いという欠点があった。
【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。
【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、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に際して、前記ＥＧＲ配管内のＥＧＲガスを冷却する装置であって、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巻装されたＥＧＲガス冷却装置において、 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ものである。
【０００６】
また、本発明では、前記冷却配管の前記ＥＧＲ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。
【０００７】
さらに、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。
【０００８】
【発明の実施の形態】
図１は本発明に係るＥＧＲガス冷却装置の一実施例を示す説明図、図２は同上ＥＧＲガス冷却装置の要部の構成を拡大して示す断面図、図３は同じく本発明装置の他の実施例を示す図２相当図、図４は同じく本発明装置の別の実施例を示す図２相当図である。
【０００９】
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、図２に拡大して示すように、ＥＧＲ配管１の外周面に、スパイラル状に凹溝１ａが形成され、エンジンの冷却水Ｗが流される冷却配管２がこの凹溝１ａ内に一部嵌合して、ＥＧＲ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。
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。
【００１０】
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ＥＧＲ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ＥＧＲ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。
【００１１】
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という効果に加えて、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。
【００１２】
また、図３に示すように、管長手方向にＥＧＲ配管１との対接部に対して平面３が形成され、したがって全体として断面ほぼ三角形状を呈した冷却配管２Ａを用い、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に巻装し、該冷却配管２とＥＧＲ配管１をろう付けまたは溶接した場合には、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ガスの冷却効率をより向上させることが可能になる。
【００１３】
さらに、図４に示すように、管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を冷却配管２Ｂとして用い、該冷却配管２Ｂを好ましくは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、該冷却配管２とＥＧＲ配管１をろう付けまたは溶接した場合には、冷却配管２Ｂが、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ＥＧＲガスの冷却効率を向上させることができる。
【００１４】
【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のみならず、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、ＥＧＲ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、冷却効果をより一層向上させることが可能になる。
【図面の簡単な説明】
【図１】 本発明に係るＥＧＲガス冷却装置の一実施例を示す説明図である。
【図２】 同上ＥＧＲガス冷却装置の要部の構成を拡大して示す断面図である。
【図３】 同じく本発明装置の他の実施例を示す図２相当図である。
【図４】 同じく本発明装置の別の実施例を示す図２相当図である。
【符号の説明】
１ ＥＧＲ配管
１ａ、１ｂ スパイラル状の凹溝
２、２Ａ、２Ｂ 冷却配管
３ 平面
４ 外壁面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an EGR gas cooling device, and more particularly, in exhaust gas recirculation (hereinafter referred to as EGR) in which a part of exhaust gas is taken out from an exhaust system, returned to the engine intake port via the EGR pipe, and added to the air-fuel mixture. The present invention relates to an EGR gas cooling device for cooling the EGR gas.
[0002]
[Prior art]
A part of the exhaust gas is taken out from the exhaust system, returned to the intake port of the engine via the EGR pipe, and added to the air-fuel mixture. When this EGR is performed, the ratio of the inert gas such as nitrogen gas and carbon dioxide in the combustion mixture increases, so that the combustion temperature is lowered and the generation of NOx can be suppressed.
Furthermore, by performing an appropriate amount of EGR, the heat loss to the coolant is reduced by reducing pump loss and the temperature of the combustion gas, and the cycle efficiency is improved by increasing the specific heat ratio by changing the amount and composition of the working gas. .
However, during EGR, if the temperature of the EGR gas is too high, the volume of the EGR gas increases and the amount of cold outside air (intake) does not increase. Therefore, the intake air temperature does not decrease, resulting in poor fuel consumption and a valve of the EGR pipe. Therefore, when the EGR rate is increased, the EGR gas in the EGR pipe needs to be appropriately cooled.
[0003]
[Problems to be solved by the invention]
In order to cool the EGR gas in the EGR pipe, conventionally, for example, as disclosed in Japanese Utility Model Publication No. 57-309, the EGR pipe has a multi-tube heat transfer tube structure, and the multi-tube heat transfer tube has an engine. A multi-tube heat exchanger that makes the cooling water contact flow is mounted on the vehicle, and the EGR gas in the multi-tube heat transfer tube is cooled by the multi-tube heat exchanger. However, this multi-tube heat exchanger has a complicated structure and has a problem in terms of manufacturing cost, and also has a problem in that the size of the apparatus increases and the weight on the vehicle increases.
Further, although EGR gas cooling means is known in which a pipe through which cooling water circulates is wound around the outer periphery of the EGR gas pipe, there is a drawback that the cooling efficiency of the EGR gas in the EGR gas pipe is low.
[0004]
The present invention has been made in view of the current state of this type of EGR gas cooling as described above, and its purpose is to simplify the structure and to produce the EGR gas efficiently in order to improve fuel efficiency. It is providing the EGR gas cooling device which cools automatically.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention takes out a part of exhaust gas from an exhaust system, returns it to the intake port of the engine through the EGR pipe, and recirculates the EGR in the EGR pipe at the time of exhaust gas recirculation added to the air-fuel mixture. An apparatus for cooling a gas, wherein an EGR gas cooling device in which a cooling pipe through which cooling water for engine cooling flows is spirally wound around an outer peripheral surface of the EGR pipe. A concave groove is formed in a spiral shape, and the cooling pipe is fitted into the concave groove and is wound in contact with the EGR pipe.
[0006]
Moreover, in this invention, it is preferable that the contact part of the said EGR piping of the said cooling piping is formed in planar shape.
[0007]
Furthermore, in the present invention, it is preferable that the cooling pipe is formed in a flat tube whose outer wall surfaces facing each other in the longitudinal direction are flat.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory view showing an embodiment of an EGR gas cooling device according to the present invention, FIG. 2 is an enlarged cross-sectional view showing the configuration of the main part of the EGR gas cooling device, and FIG. FIG. 4 is a diagram corresponding to FIG. 2 showing another embodiment of the present invention, and FIG. 4 is a diagram corresponding to FIG.
[0009]
The vehicle used in the present invention is provided with an EGR. As shown in FIG. 1, one end side is positioned at the exhaust port of the exhaust system of the vehicle and the other end side is positioned at the intake port of the engine of the vehicle. An EGR pipe 1 for taking out part E of the EGR gas discharged from the system and returning it to the intake port of the engine is provided. On the outer peripheral surface of the EGR pipe 1, as shown in an enlarged view in FIG. 2, a spiral groove 1 a is formed in the outer peripheral surface of the EGR pipe 1 in a spiral shape, and a cooling pipe 2 through which engine cooling water W flows is provided. The EGR pipe 1 is partly fitted into the concave groove 1a and wound around the EGR pipe 1, and the cooling pipe 2 and the EGR pipe 1 are preferably brazed or welded.
The pipe diameter of the EGR pipe 1 is determined by the engine displacement and the EGR rate, but the pipe diameter and winding pitch of the cooling pipe 2 are predetermined values set in advance for EGR gas returned to the engine intake port under all operating conditions. Selected to cool to a temperature of
[0010]
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 is passed through the EGR pipe 1 to the intake port of the engine. EGR is performed by being sent to the air-fuel mixture.
In this case, the flow rate of the EGR gas sent to the engine intake port by the EGR pipe 1, that is, the EGR rate, is set and controlled in advance within a range where the target NOx level and the engine stability are satisfied. .
In this way, by performing EGR, the ratio of inert gas such as nitrogen gas and carbon dioxide in the combustion mixture of the engine increases, so the combustion temperature decreases and the generation of NOx is suppressed. In addition, by performing an appropriate amount of EGR, the pump loss is reduced and the temperature of the combustion gas is lowered, so that the heat dissipation loss to the coolant is reduced, and the specific heat ratio is increased by the change in the amount and composition of the working gas. Cycle efficiency.
[0011]
In this case, according to the present invention, the EGR gas in the EGR pipe 1 is cooled by the engine cooling water in the cooling pipe 2 to the optimum temperature for performing the optimum EGR, so that the volume of the EGR gas is reduced. The amount of the cooled outside air can be reduced and the intake air temperature can be lowered to improve fuel efficiency, and the durability of the valve of the EGR pipe 1 generated due to the temperature of the EGR gas being too high, In addition to the effect that the corrosive water generated by the temperature of the EGR gas being too low does not condense or the deposit adheres and corrodes the passage , the cooling pipe 2 Of the engine that is wound around the EGR pipe 1 in a state of being in contact with the concave groove 1a of the EGR pipe 1 with a wide contact area and flows inside by the spiral concave groove 1a of the EGR pipe 1 There because of the state of being stirred becomes turbulent, it is possible to improve the cooling efficiency of the EGR gas in the EGR pipe 1.
[0012]
Further, as shown in FIG. 3, is planar 3 formed for Taise' portion of the EGR pipe 1 in the pipe longitudinal direction, thus using the cooling pipe 2A which cross section substantially exhibits a triangular shape as a whole, the cooling pipe 2A When the EGR pipe 1 is wound around the EGR pipe 1 while the plane 3 is in contact with the EGR pipe 1 and the cooling pipe 2 and the EGR pipe 1 are brazed or welded, the cooling pipe 2A is Since it is wound around the EGR pipe 1 while being in contact with the EGR pipe 1 with a wide contact area, the cooling efficiency of the EGR gas in the EGR pipe 1 can be further improved.
[0013]
Further, as shown in FIG. 4, the outer wall surfaces 4 facing each other in the longitudinal direction of the pipe are planar, and a flat pipe having an elliptical cross section as a whole is used as the cooling pipe 2B. The cooling pipe 2B is preferably formed of the EGR pipe 1. When the cooling pipe 2 and the EGR pipe 1 are brazed or welded in a spiral shape formed on the outer circumferential surface and the cooling pipe 2 and the EGR pipe 1 are brazed, the EGR pipe is connected to the cooling pipe 2B by the planar outer wall surface 4. The engine cooling water wound around the EGR pipe 1 and flowing through the spiral groove 1b of the EGR pipe 1 while being in contact with a wide contact area with the engine 1 is turbulently stirred. Therefore, the cooling efficiency of the EGR gas in the EGR pipe 1 can be improved.
[0014]
【The invention's effect】
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 via the EGR pipe, and exhaust gas recirculation added to the air-fuel mixture is performed, on the outer peripheral surface of the EGR pipe, The cooling pipe through which cooling water for engine cooling flows is wound in a spiral manner, and the EGR gas in the EGR pipe is cooled by the cooling water in the cooling pipe. Not only can reduce the manufacturing cost, reduce the vehicle weight, and efficiently cool the EGR gas, but a spiral groove is formed on the outer peripheral surface of the EGR pipe, Since the cooling pipe is fitted in the concave groove and is wound in contact with the EGR pipe, the contact area between the cooling pipe and the EGR pipe increases, and turbulent flow is generated inside the cooling pipe to Stir cooling water , Becomes the cooling effect more can be further improved.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an embodiment of an EGR gas cooling device according to the present invention.
FIG. 2 is an enlarged cross-sectional view showing a configuration of a main part of the EGR gas cooling device.
FIG. 3 is a view corresponding to FIG. 2 showing another embodiment of the apparatus of the present invention.
4 is a view corresponding to FIG. 2 showing another embodiment of the apparatus of the present invention. FIG.
[Explanation of symbols]
1 EGR piping
1a, 1b spiral groove 2, 2A, 2B Cooling piping 3 Plane 4 Outer wall

Claims (1)

排気系から排気ガスの一部を取出し、ＥＧＲ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巻装されたＥＧＲガス冷却装置において、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ＥＧＲガス冷却装置。A device that takes out a part of exhaust gas from an exhaust system, returns it to an intake port of an engine via an EGR return pipe, and cools EGR gas in the EGR pipe at the time of exhaust gas recirculation added to the air-fuel mixture, In an EGR gas cooling apparatus in which a cooling pipe through which cooling water for engine cooling flows is wound in a spiral shape on the outer peripheral surface of the pipe, a spiral groove is formed in the outer peripheral surface of the EGR pipe, and the cooling An EGR gas cooling device, wherein a pipe is fitted into the concave groove and is wound around the EGR pipe.
JP26769295A 1995-09-21 1995-09-21 EGR gas cooling device Expired - Fee Related JP3664457B2 (en)

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JP26769295A JP3664457B2 (en) 1995-09-21 1995-09-21 EGR gas cooling device

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JP3664457B2 true JP3664457B2 (en) 2005-06-29

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