EGR cooler

Abstract

The invention provides an EGR cooler used for cooling waste gas through cooling water in automobile waste gas recirculation. The EGR cooler is characterized by comprising a cover plate, a bottom plate and k layers of heat exchange cores arranged between the cover plate and the bottom plate; the heat exchange cores are formed by sequentially stacking k layers of corrugated heat exchange sheets with the two sides provided with side arc overturned edges protruding upwards, and k is an odd number larger than 2; the upper surfaces of the even number layers communicate with the lower surfaces of the odd number layers to form a first fluid channel; the upper surfaces of the odd number layers communicate with the lower surfaces of the even number layers to form a second fluid channel; and the first fluid channel is used for circulation of the cooling water, the second fluid channel is used for waste gas circulation, and accordingly the cooling water and the waste gas exchange heat with each other in the heat exchange cores. The provided EGR cooler is high in production efficiency, reliable in quality, prominent in cooling effect and capable of being widely popularized.

Description

technical field [0001] The invention belongs to the field of motor vehicles and relates to an engine cooler, in particular to an EGR cooler for recirculation of an automobile engine system. Background technique [0002] EGR refers to the exhaust gas recirculation system. Its function is to take part of the exhaust gas from the engine out of the exhaust pipe, and return it to the intake system of the engine after cooling, and enter the combustion chamber together with the mixed gas to reduce the combustion temperature, thereby reducing NO X The amount of generation will eventually meet the national emission regulations, and the EGR cooler is one of the key components of the exhaust gas recirculation system. The currently commonly used EGR cooler core is usually composed of a threaded pipe, a fixing plate, and a cylindrical shell brazed. [0003] Since the assembly gap of the welding structure of the EGR cooler core needs to be controlled within 0-0.075mm, and the holes on t...

AI Technical Summary

Problems solved by technology

[0003] Since the assembly gap of the welding structure of the EGR cooler core needs to be controlled within 0-0.075mm, and the holes on the fixing plate are punched, the dimensional tolerance accuracy is 0.1mm, so this structure cannot guarantee brazing Dimensional accuracy required, long-term use can cause leaks at welds

Moreover, there are many parts in the core of this EGR cooler, so the EGR cooler has a large volume and is inconvenient to use

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