corrugated sheet for egr cooler

Abstract

A wavy fin for an EGR cooler according to the present invention, which is mounted within a gas tube of the EGR cooler, is formed in a curved shape in which a vertical part and a horizontal part are alternately coupled to each other such that the planar shape thereof is formed in a wave pattern, wherein the vertical part has one or more notches formed at an longitudinal end thereof. The wavy fin for an EGR cooler according to the present invention has advantages in that thermal stress is not greatly generated since the wavy fin cannot only be expanded to a certain level in the longitudinal direction when heated to a high temperature but also can be thermally expanded to a certain level in the height direction, and in that the efficiency of cooling an exhaust gas can be maximized since the exhaust gas can flow in the width direction inside a gas tube.

Description

technical field [0001] The invention relates to a corrugated sheet installed in the air duct of an EGR cooler, in particular to a corrugated sheet for the EGR cooler which is formed to prevent local thermal stress from concentrating. Background technique [0002] Generally speaking, Exhaust Gas Recirculation (EGR: Exhaust Gas Recirculation) is a system to reduce NOx emissions. It recirculates part of the exhaust gas into the intake system to increase the CO 2 Concentration, the temperature of the combustion chamber is reduced, thereby reducing NOx emissions. [0003] In addition, let me introduce the mechanism of NOx in detail. The air is composed of about 79% nitrogen, 21% oxygen and other trace elements. Although nitrogen and oxygen do not react with each other at normal temperature, they do react with each other at high temperature (above about 1450° C.) to produce nitrogen oxides (thermal NOx). In particular, diesel engines use compression ignition to cause combustion....

AI Technical Summary

Problems solved by technology

[0012] However, the above-mentioned corrugated sheet 40 is not along the height direction ( figure 2 The part that bends in the upper and lower directions) generates a large stress caused by thermal expansion, that is, thermal stress, which has the disadvantage of being easily damaged.

[0013] In addition, the exhaust gas flowing into the air guide pipe 20 does not flow uniformly through the entire inner space of the air guide pipe 20 , but tends to flow concentratedly to one side of the above air guide pipe 20 .

The existing corrugated sheet 40 divides the internal space of the air duct 20 into multiple parts, and even in one air duct 20, there is a problem of temperature difference between different parts, so there is a problem that the exhaust gas cooling efficiency is reduced

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