KR20180116498A - EGR cooler having baffle for suppoting gas tube - Google Patents

EGR cooler having baffle for suppoting gas tube Download PDF

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Publication number
KR20180116498A
KR20180116498A KR1020170048457A KR20170048457A KR20180116498A KR 20180116498 A KR20180116498 A KR 20180116498A KR 1020170048457 A KR1020170048457 A KR 1020170048457A KR 20170048457 A KR20170048457 A KR 20170048457A KR 20180116498 A KR20180116498 A KR 20180116498A
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KR
South Korea
Prior art keywords
gas
gas tube
cooling water
tube
body cell
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Application number
KR1020170048457A
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Korean (ko)
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KR101977894B1 (en
Inventor
조형근
Original Assignee
주식회사 코렌스
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Priority to KR1020170048457A priority Critical patent/KR101977894B1/en
Priority to PCT/KR2017/004194 priority patent/WO2018190450A1/en
Publication of KR20180116498A publication Critical patent/KR20180116498A/en
Application granted granted Critical
Publication of KR101977894B1 publication Critical patent/KR101977894B1/en

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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
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies

Abstract

The present invention relates to an exhaust gas recirculation (EGR) cooler comprising: a body cell to supply or discharge coolant; a plurality of gas tubes arranged in a structure stacked in a thickness direction to be mounted in the body cell; a main bar lengthily extended in a stacking direction of the gas tubes to be closely adhered to one lateral side of the gas tubes; and a baffle including a plurality of extended bars extended from the main bar in the lateral direction of the gas tube to be inserted between two neighboring gas tubes. According to the present invention, the gas tubes are spaced apart from each other by the thickness of the extended bar. According to the EGR of the present invention, even if a tube protrusion is not formed on the gas tube, a separation distance between the gas tubes is constantly maintained and a position of a welding line is freely selected on the gas tube, thereby providing an advantage of improving corrosion resistance of the gas tube.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an EGR cooler having baffle for suppoting gas tube,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an idler cooler for cooling an exhaust gas flowing into an exhaust gas recirculation (EGR) To an idler cooler having a baffle that separates the baffle.

In general, EGR (Exhaust Gas Recirculation) is a system for reducing NOx by lowering the temperature of the combustion chamber by increasing the concentration of CO 2 in the intake air by recirculating part of the exhaust gas back to the intake system.

On the other hand, the mechanism of generating NOx will be described in detail. Air consists of about 79% of nitrogen, 21% of oxygen and other trace elements. Nitrogen and oxygen do not react with each other at room temperature, but they react with each other at high temperatures (about 1450 ° C or more) to become nitrogen oxides (thermal NOx). In particular, diesel engines cause combustion by compression ignition method, the compression ratio is getting higher due to the material development of the cylinder, and the temperature of the combustion chamber is increasing. The increase in the combustion chamber temperature increases the thermodynamic engine efficiency, but a large amount of nitrogen oxides is generated due to the high temperature. These nitrogen oxides are the major harmful substances that destroy the global environment, causing acid rain, optical smog, respiratory disorder, and the like.

The principle of NOx reduction by the isotope is to lower the maximum temperature of the combustion chamber by recycling the inert gas (water vapor, carbon dioxide, etc.), secondly to prevent the nitrogen oxides generating atmosphere by the lean burn, and thirdly, The ignition advance delay and the combustion chamber local maximum temperature and pressure. On the other hand, it is reported that the mechanism of NOx reduction by EGR in diesel engines is a fundamental cause of reduction of oxygen concentration, unlike gasoline, and that the decrease of flame temperature is caused by this. Although no conclusions have yet been made as to which is right at this time, it has recently been reported that the NOx reduction contribution of oxygen concentration and flame temperature is of the same level.

Izzier, equipped with Easy Al cooler, is a way to reduce NOx without fuel consumption and PM increase due to strict regulation of exhaust of diesel engine. As a cooler using coolant of engine, .

In this case, it is necessary to cool the exhaust gas temperature of about 700 ° C. to 150 ° C. to 200 ° C. In this case, the exhaust gas cooler should be made of a heat resistant material and designed to be compact in order to be installed inside the automobile. And condensation occurs from the exhaust gas during heat exchange. Since the condensed water contains sulfuric acid due to the sulfur component of the fuel, it is likely to cause corrosion, so it must be a seaworthy material. Since the mechanical load is applied due to the pulsation of the exhaust gas, And particulate matter (PM) of the exhaust gas can block the inside of the passageway, and measures against fouling are required.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a conventional IG al cooler will be described in detail with reference to the accompanying drawings.

FIG. 1 is a vertical sectional view of a conventional air cooler, and FIG. 2 is a perspective view of a gas tube included in a conventional air cooler.

Generally, an easy-to-cooler includes a body cell 10 through which cooling water flows, and a plurality of gas tubes 20 installed in the body cell 10 and through which exhaust gas flows. A plurality of tube protrusions 22 are formed in the gas tube 20. The adjacent two gas tubes 20 are arranged so that the ends of the tube protrusions 22 are in contact with each other, The cooling water can flow through the tubes 20.

In this case, the gas tube 20 is manufactured by welding one end of a metal plate. Since a plurality of tube protrusions are formed on a wide surface of the gas tube 20 (upper and lower surfaces in FIG. 2) The line is located on the narrow side (left side or right side in Fig. 2) of the gas tube 20. A high-temperature, high-pressure exhaust gas flows through the gas tube 20. Since the pressure of the exhaust gas is mainly applied to the wide surface of the gas tube 20, The welding line may be opened, or the like.

1 and 2, when a plurality of tube protrusions 22 are formed in the gas tube 20, that is, when the gas tube 20 is formed into a shape having a curvature instead of a smooth plane, The exhaust gas passing through the inside of the tube 20 is concentrated on the curved portion around the tube projection 22, so that the corresponding portion is easily corroded, and the durability of the gas tube 20 is lowered.

KR 10-0823654 B1

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a gas tube which can maintain a constant distance between gas tubes even if a tube projection is not formed in the gas tube, It is an object of the present invention to provide an easy-to-cooler which can increase the withstand pressure strength of the gas tube and improve the corrosion resistance of the gas tube.

According to another aspect of the present invention, there is provided an easy cooler comprising: a body cell through which cooling water flows; A plurality of gas tubes arranged in a structure laminated in the thickness direction and mounted in the body cell; A plurality of gas tubes extending in the stacking direction of the plurality of gas tubes to be in close contact with one side in the width direction of the plurality of gas tubes and a plurality of gas tubes inserted between two neighboring gas tubes extending in the width direction of the gas tubes from the main bar Wherein the plurality of gas tubes are spaced apart from each other by a thickness of the extension bar.

The gas tube is formed in a rectangular tube shape having a width wider than the thickness by bending a metal plate and then welding both ends, and a welding line is formed in the center portion of the upper wall or the center portion of the lower wall.

Wherein an outermost extension bar of the plurality of extension bars is inserted between an outermost gas tube and an inner side face of the body cell so that an outermost gas tube and an inner side face of the body cell are extended It is spaced by the thickness of the bar.

The plurality of extension bars are formed to have the same thickness so that the distance between the adjacent two gas tubes and the distance between the outermost gas tube and the body cell are set to be the same.

The baffle is coupled to a longitudinal stop of the gas tube.

The baffles are provided in pairs so as to be respectively coupled to both sides in the width direction of the gas tube.

The pair of baffles are coupled to the longitudinal stop of the gas tube such that the ends of the extension bars are opposed to each other and the two extension bar ends facing each other are spaced so that cooling water can flow.

A cooling water inlet pipe and a cooling water outlet pipe are coupled to one side wall of the body cell and the main bar is closely contacted between a point where one of the side walls of the body cell is coupled with the cooling water inlet pipe and a point where the cooling water outlet pipe is coupled .

The isoalcooler according to the present invention can maintain a constant distance between the gas tubes even if the tube projection is not formed in the gas tube and can freely select the position of the welding line of the gas tube, And the corrosion resistance of the gas tube can be improved.

1 is a vertical cross-sectional view of a conventional easy cooler.
Fig. 2 is a perspective view of a gas tube included in a conventional air cooler.
Fig. 3 is a perspective view of an easy-to-cooler according to the present invention.
4 is a cross-sectional perspective view of an easy-to-cooler according to the present invention.
5 and 6 are a perspective view and an exploded perspective view showing a coupling structure of a support baffle included in an easy cooler according to the present invention.
7 is a cross-sectional view showing a coolant flow path of an easy cooler according to the present invention.
FIGS. 8 and 9 are a perspective view and an exploded perspective view showing a coupling structure of a support baffle included in the second embodiment of the easy-cooler according to the present invention.
10 is a cross-sectional view showing a cooling water flow path in the second embodiment of the isoalcooler according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a perspective view of an easy al cooler according to the present invention, FIG. 4 is a perspective view of an easy al cooler according to the present invention, and FIGS. 5 and 6 are cross- And FIG.

The isoalcooler according to the present invention is an apparatus for exchanging heat between exhaust gas and cooling water and includes a body cell 100 having a cooling water inflow pipe 110 and a cooling water outflow pipe 120 to allow cooling water to flow in and out, A plurality of gas tubes 200 arranged in the body cell 100 to be stacked on the gas tube 200 and a wave pin 300 mounted in the gas tube 200 as basic components, Even if a separate tube projection is not formed on the gas tube 200, even if the surface of the gas tube 200 is formed in a smooth plane shape, the two neighboring gas tubes 200 are spaced apart from each other by a predetermined distance. There are big features.

That is, the easy-to-cooler according to the present invention is characterized in that the baffle 400 further includes a plurality of gas tubes 200 spaced apart at regular intervals. The baffle 400 includes a plurality of gas tubes 200 extending in the stacking direction of the plurality of gas tubes 200 in the vertical direction and being in close contact with one side in the width direction of the plurality of gas tubes 200 And a plurality of extension bars 420 inserted between two neighboring gas tubes 200 extending in the width direction of the gas tube 200 from the main bar 410.

The extension bar 420 inserted between two neighboring gas tubes 200 is in contact with the bottom surface of the gas tube 200 located on the upper side and the upper surface of the gas tube 200 located on the lower side, The gas tube 200 and the gas tube 200 located at the lower side are kept apart from each other by the thickness of the extension bar 420. [

As described above, when the plurality of gas tubes 200 are configured to be spaced apart by the baffle 400, there is no need to form tube projections in the gas tube 200, It is possible to prevent the exhaust gas flowing inside the gas tube 200 from concentrating on a bent portion around the tube projection to easily corrode the corresponding portion. Further, when the gas tube 200 is bent, noise and vibration occur when the exhaust gas flows. However, since the gas tube 200 included in the present invention has a smooth inner surface, The vibration is remarkably reduced.

Meanwhile, the gas tubes 200 applied to the Izu al coolers are formed in a rectangular tube shape having a width wider than the thickness and are stacked in the thickness direction. The gas tubes 200 are manufactured by bending a metal plate and welding both ends do. At this time, since the tube projection does not need to be provided on the surface of the gas tube 200 included in the present invention, the welding line can be located at any point. That is, the welding line may be formed on the side wall in the width direction (the left side wall or the right side wall in this embodiment) of the gas tube 200, or on the side wall in the thickness direction of the gas tube 200 Lower side wall).

Since the side wall of the gas tube 200 in the thickness direction is wider than the side wall in the width direction, the pressure of the exhaust gas flowing into the gas tube 200 is mainly applied in the vertical direction. Accordingly, when the welding line of the gas tube 200 is formed on the side wall in the width direction of the gas tube 200, there is an increased possibility that the welding line is opened by the pressure of the exhaust gas, Is preferably formed at the center of the upper or lower wall.

If the welding line of the gas tube 200 is formed at the center of the upper wall and the lower wall of the gas tube 200, the welding line can not be easily opened even if the pressure of the exhaust gas is large, It is possible to obtain an effect of increasing the structural strength of the substrate. Since the gas tube 200 is formed to be narrower in the width direction side wall (left side wall or right side wall) than the thickness direction side wall (upper side wall or lower side wall) as described above, the conventional gas tube 200 ) May be difficult to weld in the width direction side wall. In contrast, when welding is performed on the side walls in the thickness direction as in the case of the gas tube 200 included in the present invention, the welding operation can be easily performed.

Since the exhaust gas flowing in the gas tube 200 undergoes heat exchange with the cooling water flowing outside the gas tube 200, the heat exchange rate of each gas tube 200 increases or decreases in proportion to the amount of cooling water flowing outside. In the isoalcooler according to the present invention, the coolant flow rate in contact with the gas tube 200 located at the center and the gas tube 200 positioned at the outermost position are set so that the heat exchange rates of the gas tubes 200 can be the same, It is preferable that the distance between the two gas tubes 200 adjacent to each other and the distance between the outermost gas tube 200 and the body cell 100 are set to be the same Do.

The outermost bar 420 of the plurality of extension bars 420 is inserted between the outermost gas tube 200 and the inner surface of the body cell 100 and the gas tube 200 And the inner side surface of the body shell 100. [0051] As shown in FIG. When the outermost extension bar 420 contacts both the gas tube 200 and the body cell 100, the gas tube 200 located at the outermost position and the inner side surface of the body cell 100 The gas tubes 200 are spaced apart from each other by the thickness of the extension bar 420, so that the heat exchange rates of all the gas tubes 200 are equalized.

Of course, in order that the distance between the adjacent two gas tubes 200 and the distance between the outermost gas tube 200 and the body cell 100 are set equal to each other, The plurality of extension bars 420 should be made to have the same thickness.

7 is a cross-sectional view showing a coolant flow path of an easy cooler according to the present invention.

When the baffle 400 for maintaining a constant distance between the gas tubes 200 is biased to one side of the longitudinal direction of the gas tube 200, the other longitudinal side of the gas tube 200 can not be stably fixed, There is a concern. Accordingly, the baffle 400 is preferably coupled to the longitudinal stop of the gas tube 200 such that both longitudinal sides of the gas tube 200 can be balanced and stably fixed.

The cooling water inflow pipe 110 for supplying the cooling water to the inside of the body cell 100 and the cooling water outflow pipe 120 for discharging the cooling water in the body cell 100 to the outside are connected to one side wall of the body cell 100 The main bar 410 may be in close contact with a point where one side of the body cell 100 is coupled with the cooling water inflow pipe 110 and a point where the cooling water outflow pipe 120 is coupled.

When the baffle 400 is installed between the cooling water inflow pipe 110 and the cooling water outflow pipe 120, the cooling water introduced into the body cell 100 through the cooling water inflow pipe 110 flows into the cooling water inflow pipe 110, The cooling water flowing into the body cell 100 flows through the cooling water outlet pipe 120 while flowing to a portion where the baffle 400 is not present (lower region in FIG. 7) And evenly contact the entire outer surface of the gas tube (200). Therefore, it is possible to obtain the effect of maximizing the cooling performance of the easy cooler according to the present invention.

In this case, if the baffle 400 is not completely in contact with the inner wall of the body cell 100, the cooling water flowing through the cooling water inlet may flow directly into the cooling water outlet through the baffle 400, The side corresponding to the inner wall of the body cell 100 should be in close contact with the inner wall of the body cell 100.

FIGS. 8 and 9 are a perspective view and an exploded perspective view showing a coupling structure of the support baffle 400 included in the second embodiment of the present invention according to the present invention, and FIG. 10 is a cross- Sectional view showing an exemplary cooling water flow path.

When the baffle 400 is configured to maintain a distance between the gas tubes 200 as in the embodiment shown in FIGS. 5 to 7, that is, when the baffle 400 is coupled to only one side in the width direction of the gas tube 200 The other side in the width direction of the gas tube 200 may not be stably fixed and may be shaken.

Accordingly, the baffles 400 are provided in pairs and can be respectively coupled to both sides of the gas tube 200 in the width direction. When the pair of baffles 400 are coupled to both sides of the gas tube 200 on both sides in the width direction, the gap between the gas tubes 200 can be stably fixed on one side and the other side in the width direction have.

At this time, if the ends of the pair of baffles 400 are in contact with each other, that is, when the ends of the extension bars 420 included in the respective baffles 400 are brought into contact with each other, The cooling water flowing through the cooling water inlet pipe 110 can not flow to the cooling water outlet pipe 120. [ Accordingly, the pair of baffles 400 are coupled to the longitudinal stop of the gas tube 200 such that the ends of the extension bars 420 face each other, It is preferable to be spaced by a certain distance so as to flow.

10, the cooling water flowing through the cooling water inflow pipe 110 flows into the opposite side (the side where the cooling water inflow pipe 110 is coupled) (Lower side in the embodiment), then U-turns, and then passes between the two extension bars 420. [ Part of the cooling water that has passed between the two extension bars 420 is directly discharged to the outside through the cooling water outlet, the rest of the cooling water that has passed between the two extension bars 420 flows downward, the cooling water flowing into the body cell 100 can be uniformly contacted over the entire outer surface of the gas tube 200. [

The baffle 400 may be disposed on the inner wall of the body cell 100 such that the inner wall of the body cell 100 is closely contacted with the inner wall of the body cell 100. In this case, .

 While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the present invention.

100: Body cell 110: Cooling water inlet pipe
120: cooling water outlet tube 200: gas tube
300: Wave pin 400: Baffle
410: Main bar 420: Extension bar

Claims (8)

A body cell through which cooling water flows;
A plurality of gas tubes arranged in a structure laminated in the thickness direction and mounted in the body cell;
A plurality of gas tubes extending in the stacking direction of the plurality of gas tubes to be in close contact with one side in the width direction of the plurality of gas tubes and a plurality of gas tubes inserted between two neighboring gas tubes extending in the width direction of the gas tubes from the main bar A baffle consisting of an extension bar;
Including,
Wherein the plurality of gas tubes are spaced apart from each other by a thickness of the extension bar. The method according to claim 1,
The gas tube may include:
Wherein a weld line is formed at a central portion of the upper wall or a central portion of the lower wall, wherein the welding line is formed in a rectangular tube shape having a width wider than the thickness by bending a metal plate and welding both ends thereof. The method according to claim 1,
Wherein an outermost bar of the plurality of extension bars is inserted between an outermost gas tube and an inner surface of the body cell,
Wherein an outermost gas tube and an inner surface of the body cell are spaced apart from each other by a thickness of the extension bar. The method of claim 3,
The plurality of extension bars are formed to have the same thickness,
Wherein the distance between the two adjacent gas tubes and the distance between the outermost gas tube and the body cell are the same. The method according to claim 1,
Wherein the baffle is coupled to a longitudinal stop of the gas tube. The method according to claim 1,
And the baffles are provided in pairs so as to be respectively coupled to both sides in the width direction of the gas tube. The method of claim 6,
The pair of baffles being coupled to the longitudinal stop of the gas tube such that the ends of the extension bars face each other,
The two extension bars facing each other are spaced apart to allow cooling water to flow. The method according to claim 1,
A cooling water inlet pipe and a cooling water outlet pipe are coupled to one side wall of the body cell,
Wherein the main bar is in close contact with a point where one of the side walls of the body cell is coupled with the cooling water inlet pipe and a point where the cooling water outlet pipe is coupled.
KR1020170048457A 2017-04-14 2017-04-14 EGR cooler having baffle for suppoting gas tube KR101977894B1 (en)

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KR1020170048457A KR101977894B1 (en) 2017-04-14 2017-04-14 EGR cooler having baffle for suppoting gas tube
PCT/KR2017/004194 WO2018190450A1 (en) 2017-04-14 2017-04-19 Egr cooler having baffle for supporting gas tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020170048457A KR101977894B1 (en) 2017-04-14 2017-04-14 EGR cooler having baffle for suppoting gas tube

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KR101977894B1 KR101977894B1 (en) 2019-05-14

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WO2020101152A1 (en) * 2018-11-14 2020-05-22 한온시스템 주식회사 Heat exchanger
JP2022510571A (en) * 2018-11-14 2022-01-27 ハンオン システムズ Heat exchanger

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US11885286B2 (en) 2021-04-09 2024-01-30 Caterpillar Inc. Separator plate for cooling tubes

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JP2022510571A (en) * 2018-11-14 2022-01-27 ハンオン システムズ Heat exchanger

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