Exhaust gas cooler

Abstract

The present invention relates to an exhaust gas cooler comprising: a heat exchange pipe received in a cooling water of an engine, wherein an exhaust gas of the engine that exchanges heat with the cooling water passes through the heat exchange pipe; and a plate for mounting the heat exchange pipe in the engine, wherein the heat exchange pipe includes: a first pipe communicating with a supply port for the exhaust gas; a second pipe communicating with the first pipe and guiding the exhaust gas, which is introduced from the first pipe, in one direction; and a third pipe communicating with a recovery port for the exhaust gas and the second pipe and changing the direction of the exhaust gas introduced from the second pipe to guide the same to the recovery port, wherein a heat dissipation fin is formed in the internal flow passage of the second pipe. Accordingly, the flow passage for the exhaust gas passing through the heat exchange pipe increases in length and smoothly turns in the limited space, which makes it possible to reduce a pressure drop of the exhaust gas and to increase the heat exchange area of the exhaust gas. Thus, heat exchange efficiency can be enhanced in the limited space.

Description

technical field [0001] Exemplary embodiments of the present invention relate to an exhaust gas cooler, and more particularly, to an exhaust gas cooler mounted to an engine, wherein a part of the exhaust gas is recirculated into the combustion chamber so as to cool the recirculation of the engine exhaust. Background technique [0002] Typically, vehicle exhaust contains a large amount of harmful substances, such as carbon monoxide, nitrogen oxides, and hydrocarbons. In particular, the generation rate of harmful substances such as nitrogen oxides increases as the temperature of the engine increases. [0003] Nowadays, exhaust regulations in various countries are being strengthened. In order to meet such intensified exhaust regulations of various countries, an exhaust gas recirculation (EGR) device is provided in vehicles as a means for reducing harmful substances such as nitrogen oxides contained in exhaust gas. [0004] The EGR device supplies a part of the exhaust gas of ...

AI Technical Summary

Problems solved by technology

However, since the direction of the flow channel changes sharply, the pressure drop of the exhaust gas increases (the difference between the pressure of the exhaust gas at the inlet of the heat exchange tube and the pressure of the exhaust gas at the outlet of the heat exchange tube increases), thereby reducing heat transfer efficiency

In addition, since the heat exchange tube is curved, no separate heat dissipation fins can be provided in the heat exchange tube

As a result, the improvement of heat transfer performance is limited

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