WO2018194230A1 - Refroidisseur de recirculation des gaz d'échappement (egr) ayant une fluidité améliorée de l'eau de refroidissement - Google Patents

Refroidisseur de recirculation des gaz d'échappement (egr) ayant une fluidité améliorée de l'eau de refroidissement Download PDF

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Publication number
WO2018194230A1
WO2018194230A1 PCT/KR2017/012609 KR2017012609W WO2018194230A1 WO 2018194230 A1 WO2018194230 A1 WO 2018194230A1 KR 2017012609 W KR2017012609 W KR 2017012609W WO 2018194230 A1 WO2018194230 A1 WO 2018194230A1
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WO
WIPO (PCT)
Prior art keywords
baffle
coolant
body cell
cooling water
inlet pipe
Prior art date
Application number
PCT/KR2017/012609
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English (en)
Korean (ko)
Inventor
조형근
Original Assignee
주식회사 코렌스
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Filing date
Publication date
Application filed by 주식회사 코렌스 filed Critical 주식회사 코렌스
Publication of WO2018194230A1 publication Critical patent/WO2018194230A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials

Definitions

  • the present invention relates to an EG cooler for cooling exhaust gas flowing into an exhaust gas recirculation system (EGR: Exhaust Gas Recirculation (EGR)) with cooling water, and more particularly, to increase exhaust gas cooling efficiency.
  • EGR Exhaust Gas Recirculation
  • the present invention relates to an EG cooler having a simple internal structure.
  • Exhaust Gas Recirculation is a system in which a part of the exhaust gas is recycled back to the intake system to increase the concentration of CO 2 in the intake air, thereby lowering the temperature of the combustion chamber and thereby reducing the NOx.
  • the mechanism of NOx generation in detail, consists of about 79% nitrogen, 21% oxygen and other trace elements.
  • nitrogen and oxygen do not react with each other, but at high temperature (above about 1450 ° C), they react with each other to form nitrogen oxides (thermal NOx).
  • thermal NOx nitrogen oxides
  • diesel engines generate combustion by compression ignition method, and the compression ratio is getting higher due to the development of the material of the cylinder, thereby increasing the temperature of the combustion chamber.
  • Increasing the combustion chamber temperature increases the efficiency of the thermodynamic engine, but a large amount of nitrogen oxides are generated due to the high temperature.
  • These nitrogen oxides are the main harmful substances that destroy the global environment, causing acid rain, optical smog, respiratory disorders, and the like.
  • the principle of NOx reduction by EZR is to lower the maximum temperature of the combustion chamber by recirculating inert gas (steam, carbon dioxide, etc.), second, to prevent the atmosphere of nitrogen oxide formation by lean combustion, and To reduce the ignition delay and lower the local maximum temperature and pressure in the combustion chamber.
  • inert gas steam, carbon dioxide, etc.
  • EGR the NOx reduction mechanism by EGR has been reported that the reduction of the oxygen concentration is the root cause and the study that the flame temperature decrease is the cause. At this time, no conclusion about which is right is given, but the contribution of NOx reduction in oxygen concentration and flame temperature has recently been reported to be at the same level.
  • EZR is equipped with EZR cooler, which reduces NOx without increasing fuel economy and PM due to stricter diesel emission control, and installs a cooler (cooler) using coolant from the engine. It is a device that can be obtained.
  • the EZR cooler should be cooled to 700 °C to 200 °C, so it must be heat-resistant and must be compactly designed to be installed inside the car. Should be minimized, and condensation is generated from exhaust gas during heat exchange and sulfuric acid is included in the condensate because it is susceptible to corrosion. Since particulate matter (PM) of the exhaust gas can block the inside of the passage, countermeasure against fouling is required.
  • PM particulate matter
  • FIG. 1 is a perspective view of a conventional EZ cooler
  • FIG. 2 is a longitudinal cross-sectional view of a conventional EZ cooler.
  • an EZR cooler in general, includes a body cell 10 including a coolant inlet pipe 11 and a coolant outlet pipe 12 so that the coolant flows in and out, and a plurality of gases installed in the body cell 10 through which exhaust gas flows.
  • the tube 20 is provided as a basic component. 2 illustrates a case in which a plurality of gas tubes 20 are vertically arranged.
  • the space between the plurality of gas tubes 20 is secured to allow the cooling water to flow, and the body cell 10 and the gas tube 20 to allow the cooling water to flow between the body cell 10 and the gas tube 20. ) Is configured to maintain a distance apart.
  • the distance between the two neighboring gas tube 20, and the separation distance between the body cell 10 and the gas tube 20 can be kept constant, both sides in the width direction of the gas tube 20 ( In FIG. 2, a plurality of baffles 30 are mounted in a zigzag pattern on the upper side and the lower side. As described above, the baffle 30 that secures the separation space to allow the cooling water to flow is also applied to the conventional EZ cooler in the same manner, and thus the detailed description of the baffle 30 will be omitted.
  • the coolant introduced into the body cell 10 through the coolant inlet pipe 11 flows in a zigzag form along the arrangement pattern of the baffle 30, and thus, in the gas tube 20. After the heat exchange with the exhaust gas, it is discharged to the outside of the body cell 10 through the cooling water discharge pipe (12).
  • the gas tube 20 is the end (left end in Figure 2) of the side in which the coolant inlet pipe 11 is located in the both ends of the longitudinal direction is set as the exhaust gas inlet, the coolant inlet pipe 11 of both sides in the longitudinal direction
  • the side where) is located needs to be concentratedly cooled.
  • the conventional EZC cooler flows to the side (right side in FIG. 2) in which the exhaust gas outlet pipe 12 is formed after the coolant introduced through the coolant inlet pipe 11 falls downward, as shown in FIG. 2. , The exhaust gas inlet end side of the gas tube 20 is not cooled effectively.
  • the present invention has been proposed to solve the above problems, it is possible to effectively cool the exhaust gas inlet end side of the gas tube, improve the fluidity of the cooling water, and to provide an EG cooler capable of simplifying the internal structure
  • the purpose is to.
  • the body cell is provided with a cooling water inlet pipe and a cooling water outlet pipe;
  • a plurality of gas tubes which are formed in a duct shape in which exhaust gas flows and are mounted in the body cell, and the exhaust gas inlets are arranged toward the side where the cooling water inlet pipe is provided and stacked in a thickness direction;
  • a plurality of gas tubes disposed on both sides of the plurality of gas tubes in a width direction such that one side is inserted into a space between two neighboring gas tubes and a space between the gas tube and the body cell, and arranged in a zigzag pattern along a length direction of the gas tubes.
  • the coolant inlet pipe is provided at a side of the sidewall of the body cell corresponding to one side of the gas tube in a width direction thereof, and includes an exhaust gas inlet end of the gas tube in the body cell.
  • the cooling water discharge direction is formed to be inclined so as to supply the cooling water to this side.
  • the plurality of baffles are mounted between the coolant inlet pipe and the coolant outlet pipe, and the first baffle closest to the coolant inlet pipe is located opposite the side wall of the body cell in which the coolant inlet pipe is mounted.
  • the horizontal separation distance between the cooling water inlet pipe and the first baffle is set equal to the horizontal separation distance between two neighboring baffles.
  • At least one of the plurality of baffles is arranged to be inclined such that one side extending direction crosses the width direction of the gas tube, and one side extending direction of the baffle is toward the side where the cooling water outlet pipe is provided in both longitudinal directions of the body cell. It is configured to.
  • baffles closest to the cooling water outlet pipe of the plurality of baffles are arranged such that one side extending direction is parallel to the width direction of the gas tube, and the other one of the baffles has one side extending direction in the width direction of the gas tube. It is arranged to be inclined to intersect.
  • At least two of the plurality of baffles are arranged such that one side extending direction crosses the width direction of the gas tube, and an angle between the width direction of the gas tube and the extending direction of the baffle is between the baffle and the cooling water inlet pipe. It is set to be inversely proportional to the distance.
  • the baffle is mounted in a rotatable structure such that one side extending direction is parallel to the width direction of the gas tube or arranged in a direction crossing the width direction of the gas tube, and the one side extending direction of the baffle is aligned with the width direction of the gas tube. It further comprises a spring for applying an elastic force to the baffle to face in parallel direction.
  • the EG cooler according to the present invention can discharge the cooling water toward the exhaust gas inlet end of the gas tube to cool the exhaust gas more effectively, improve the cooling efficiency by improving the fluidity of the cooling water, and reduce the number of baffles
  • the advantage is that the internal structure can be simplified.
  • FIG. 1 is a perspective view of a conventional RG cooler.
  • FIG. 2 is a vertical cross-sectional view of a conventional RG cooler.
  • FIG 3 is a longitudinal cross-sectional view of an EG cooler according to the present invention.
  • Fig. 4 is a longitudinal sectional view of an EZR cooler according to a second embodiment of the present invention.
  • Fig. 5 is a longitudinal sectional view of an EZR cooler embodiment 3 according to the present invention.
  • FIG 3 is a longitudinal cross-sectional view of an EG cooler according to the present invention.
  • EZ cooler is a device for cooling the exhaust gas by heat-exchanging the coolant and the exhaust gas
  • the cooling water inlet pipe 110 is provided on the upper surface of one side in the longitudinal direction (left in Figure 3) and the other side in the longitudinal direction (Fig. 3, the body cell 100 having the coolant outlet pipe 120 on the bottom surface of the right side) is formed in a duct shape through which exhaust gas flows, and is mounted in the body cell 100.
  • the plurality of gas tubes 200 are mounted on both sides in the width direction so that one side is inserted into a space between two neighboring gas tubes 200 and a space between the gas tubes 200 and the body cell 100.
  • Two baffles 300 as basic components.
  • the plurality of gas tubes 200 are formed in a rectangular tube shape having a width greater than the thickness thereof and are stacked in a thickness direction, and an opening through which exhaust gas flows, that is, an exhaust gas inlet is provided with the cooling water inlet pipe 110 ( 3 is arranged to face left).
  • the baffle 300 is arranged in a zigzag pattern along the longitudinal direction of the gas tube 200 so that the cooling water flowing in the video cell can be bent rather than flowing in a straight line.
  • the EZR cooler according to the present invention may be concentrated so that the hottest portion of the gas tube 200 is intensively cooled, that is, the coolant supplied from the outside may be concentrated and discharged toward the exhaust gas inlet side of the gas tube 200.
  • the first feature is that the cooling water inlet pipe 110 is disposed to be inclined obliquely.
  • the coolant inlet pipe 110 is provided on a side (upper side in FIG. 3) of the side wall of the body cell 100 corresponding to one side in the width direction of the gas tube 200, and the inside of the body cell 100.
  • the coolant discharge direction is formed to be inclined to supply the coolant to a side (left side in FIG. 3) where the exhaust gas inlet end of the gas tube 200 is located. Therefore, the coolant flowing into the body cell 100 through the coolant inlet pipe 110 is primarily in contact with the hottest exhaust gas inlet end side of the gas tube 200, thereby maximizing the heat exchange rate between the exhaust gas and the coolant. You can get the effect.
  • the coolant inlet pipe 110 is inclined like the EZ cooler according to the present invention, the coolant discharged through the coolant inlet pipe 110 does not hit the inner wall of the body cell 100 vertically but obliquely at an angle. Since it hits, there is an advantage that the flow rate of the coolant does not decrease rapidly, that is, the flowability of the coolant is maintained high. In addition, since the impact force due to the coolant flow pressure is reduced, the effect that the noise and vibration due to the coolant flow is reduced can also be obtained.
  • the EZR cooler according to the present invention may omit the baffle 30 located immediately below the coolant inlet pipe 11 among the baffles 30 shown in FIG. 2, thereby reducing the number of baffles 300. There is an advantage that it can.
  • the plurality of baffles 300 included in the present invention are mounted between the coolant inlet pipe 110 and the coolant outlet pipe 120, and the first baffle 300 located closest to the coolant inlet pipe 110 is provided. If the coolant inlet pipe 110 is installed on the side wall of the body cell 100 (upper side in FIG. 3), a result of inhibiting the flow of the coolant flowing backward after hitting the bottom surface of the body cell 100 is achieved. Results in. Therefore, the first baffle 300 positioned closest to the coolant inlet pipe 110 is opposite to the coolant inlet pipe 110 of the sidewall of the body cell 100, as shown in this embodiment (FIG. 3). In the lower side).
  • the coolant flowing in the body cell 100 flows in a zigzag pattern along the arrangement pattern of the baffle 300. If the separation distance between the baffles 300 is irregular, the coolant flows at a constant speed because the cross-sectional area of the coolant flows varies. I can't get the problem. Therefore, the horizontal separation distance between two neighboring baffles 300 is preferably kept constant.
  • the coolant discharged through the coolant inlet pipe 110 hits an inner wall of one side of the body cell 100 and hits the bottom surface of the body cell 100, and then flows to the rear side of the body cell 100. Since the point that hits the bottom surface of the body cell 100 is near the vertical downward of the coolant inlet pipe 110, the horizontal separation distance between the coolant inlet pipe 110 and the first baffle 300 is adjacent to the two adjacent parts. Preferably set equal to the horizontal separation distance between the two baffles (300).
  • the EZR cooler according to the present invention includes a horizontal separation distance l1 between the cooling water inlet pipe 110 and the first baffle 300 (the baffle 300 positioned at the leftmost in FIG. 3), and The horizontal separation distance l2 between the first baffle 300 and the second baffle 300 (the baffle 300 located in the center in FIG. 3), the second baffle 300 and the third baffle 300 ( In FIG. 3, it is preferable that the horizontal separation distance l3 between the baffles 300 positioned at the rightmost sides is set to the same distance.
  • the horizontal separation distances l1, l2, and l3 of the baffles 300 may be increased or decreased within a certain range depending on various conditions such as the flow rate of the coolant, the flow pattern, and the shape and number of the baffles 300.
  • Fig. 4 is a longitudinal sectional view of an EZR cooler according to a second embodiment of the present invention.
  • the cooling water flowing in the body cell 100 flows along the extending direction of the baffle 300, and is parallel to the width direction of the gas tube 200 in the baffle 300 as illustrated in FIG.
  • the coolant when configured to extend in the vertical direction, the coolant may vertically hit the baffle 300 to cause problems such as fluidity degradation and noise and vibration.
  • the EG cooler according to the present invention at least one of the plurality of baffles 300 is to be set such that the one extending direction is inclined obliquely toward the rear of the body cell 100 as shown in FIG. Can be. That is, the extension direction of the baffle 300 crosses the width direction of the gas tube 200, but the side (right side in FIG. 4) provided with the coolant outlet pipe 120 on both sides in the longitudinal direction of the body cell 100. Can be arranged at an angle to the slant.
  • the baffle 300 When the baffle 300 is arranged to be inclined as described above, since the coolant flowing inside the body cell 100 does not hit the baffle 300 vertically but hits at a gentle angle, the fluidity of the coolant may be reduced. Accordingly, there is an advantage that can also reduce the occurrence of noise and vibration. In this case, when the inclination angle of the baffle 300 is too small, the impact force between the coolant and the baffle 300 is large, and when the inclination angle of the baffle 300 is too large, the cooling water may not flow in a zigzag pattern.
  • the angle at which the baffle 300 is inclined is appropriately selected according to the specifications of the baffle 300 and the flow characteristics of the cooling water.
  • the baffle 300 positioned closest to the coolant outlet pipe 120 among the plurality of baffles 300 is arranged such that one side extending direction is parallel to the width direction of the gas tube 200, and the plurality of baffles ( Only the remaining baffles 300 of 300 are preferably arranged obliquely.
  • Fig. 5 is a longitudinal sectional view of an EZR cooler embodiment 3 according to the present invention.
  • the coolant supplied into the body cell 100 has a considerably large hydraulic pressure at the time of being discharged from the coolant inlet pipe 110, but is in contact with the body cell 100 or the gas tube 200 while flowing inside the body cell 100.
  • the flow rate is continuously reduced. Therefore, when the coolant flowing inside the body cell 100 collides with the baffles 300, a relatively large impact force is generated in the first baffle 300, but a relatively small impact force is generated in the rearmost baffle 300. do.
  • an angle at which the baffles 300 are inclined that is, between the width direction of the gas tube 200 and the extension direction of the baffle 300.
  • the angle of may be set differently depending on the position where the baffle 300 is mounted.
  • the first baffle 300 that is closest to the coolant inlet pipe 110 is inclined.
  • the angle ⁇ 1 is preferably set larger than the tilt angle ⁇ 2 of the second baffle 300.
  • the angle at which each of the baffles 300 is inclined decreases as the baffle 300 moves away from the coolant inlet pipe 110, that is, inversely proportional to the distance between the baffle 300 and the coolant inlet pipe 110. Is preferably set.
  • the pressure of the cooling water supplied into the body cell 100 may vary according to various conditions.
  • the pressure of the cooling water is large, the impact force with the baffle 300 is largely generated, so the baffle 300 is inclined at a large angle.
  • the baffle 300 is preferably tilted only slightly to increase the contact time between the cooling water and the gas tube 200.
  • the baffle 300 mounted on the EZC cooler is generally fixedly coupled to the gas tube 200, it is impossible to change the inclination angle according to the pressure change of the coolant.
  • the EG cooler according to the present invention may be configured such that the inclination angle of the baffle 300 is automatically changed to match the pressure of the cooling water. That is, the baffle 300 is mounted in a rotatable structure such that one side extending direction is parallel to the width direction of the gas tube 200 or arranged in a direction crossing the width direction of the gas tube 200. A spring (not shown) for applying an elastic force to the baffle 300 may be additionally installed such that one side extending direction of the 300 faces a direction parallel to the width direction of the gas tube 200.
  • the baffle 300 When the baffle 300 is mounted in such a manner as to be rotatable, when the hydraulic pressure of the coolant is greater than the elastic force of the spring, the baffle 300 is rotated by an angle of the coolant, and thus the impact force between the coolant and the baffle 300 is increased. Can be reduced. On the contrary, when the hydraulic pressure of the cooling water is smaller than the elastic force of the spring, the baffle 300 is returned to its original state (one extending direction is parallel to the width direction of the gas tube 200) by the spring elastic force.
  • the contact time between the coolant and the gas tube 200 is maximized while maintaining the magnitude of the impact force between the baffle 300 and the coolant below a predetermined level.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

Un refroidisseur d'EGR, selon la présente invention, comprend : une cellule de corps pourvue d'un tube d'entrée d'eau de refroidissement et d'un tube de sortie d'eau de refroidissement ; une pluralité de tubes de gaz présentant une forme de conduits à travers lesquels un gaz d'échappement s'écoule et installés à l'intérieur de la cellule de corps, les orifices d'entrée de gaz d'échappement étant alignés de manière à faire face au côté pourvu du tube d'entrée d'eau de refroidissement et empilés dans la direction de l'épaisseur ; et une pluralité de déflecteurs installés sur deux côtés dans le sens de la largeur de la pluralité de tubes de gaz de telle sorte qu'un côté d'un déflecteur est inséré dans un espace entre deux tubes de gaz adjacents et dans un espace entre les tubes de gaz et la cellule de corps, le tube d'entrée d'eau de refroidissement étant disposé sur une paroi latérale de la cellule de corps qui correspond à un côté dans la direction de la largeur des tubes de gaz, et est disposé de telle sorte que la direction d'évacuation d'eau de refroidissement est inclinée de façon à fournir de l'eau de refroidissement au côté où une extrémité entrée de gaz d'échappement des tubes à gaz est positionnée à l'intérieur de la cellule de corps.
PCT/KR2017/012609 2017-04-17 2017-11-08 Refroidisseur de recirculation des gaz d'échappement (egr) ayant une fluidité améliorée de l'eau de refroidissement WO2018194230A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2017-0049195 2017-04-17
KR1020170049195A KR101825120B1 (ko) 2017-04-17 2017-04-17 냉각수 유동성이 개선된 이지알 쿨러

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002310577A (ja) * 2001-04-13 2002-10-23 Mitsubishi Heavy Ind Ltd 多管式熱交換器
KR20120127401A (ko) * 2009-11-18 2012-11-21 발레오 테르미코 에스.에이. 가스용, 특히 엔진의 배기 가스용 열교환기
US20130327499A1 (en) * 2011-02-21 2013-12-12 International Engine Intellectual Property Company, Llc Egr cooler and method
KR20150099732A (ko) * 2012-11-06 2015-09-01 보그워너 에미션스 시스템스 스페인, 에스.엘.유. 유체간 열 교환을 위한 열교환 장치
JP5988296B2 (ja) * 2011-08-10 2016-09-07 臼井国際産業株式会社 多管式熱交換器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002310577A (ja) * 2001-04-13 2002-10-23 Mitsubishi Heavy Ind Ltd 多管式熱交換器
KR20120127401A (ko) * 2009-11-18 2012-11-21 발레오 테르미코 에스.에이. 가스용, 특히 엔진의 배기 가스용 열교환기
US20130327499A1 (en) * 2011-02-21 2013-12-12 International Engine Intellectual Property Company, Llc Egr cooler and method
JP5988296B2 (ja) * 2011-08-10 2016-09-07 臼井国際産業株式会社 多管式熱交換器
KR20150099732A (ko) * 2012-11-06 2015-09-01 보그워너 에미션스 시스템스 스페인, 에스.엘.유. 유체간 열 교환을 위한 열교환 장치

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