Exhaust gas recirculation (EGR) cooler

Abstract

The invention relates to the field of coolers, in particular to an exhaust gas recirculation (EGR) cooler suitable for exhaust gas recirculation in an engine system. The EGR cooler comprises a water pipe welded on a barrel body and fixing plates installed at two ends of the barrel body, wherein end covers are fixedly installed on the fixing plates at two ends of the barrel body, the connecting position of the barrel body and the water pipe is provided with a turnup structure, and the edges of the fixing plates are bent to form stepped structures. Improvement of an existing EGR cooler structure is that the barrel body is connected with the water pipe by adopting a punching turnup structure, and simultaneously the fixing plates are designed into the stepped structures, so that the EGR cooler can meet the braze welding requirement, remarkably reduce the manufacture cost and accordingly improve product competitiveness. By means of the structure, the production efficiency is high, the braze welding strength is high, and the quality is stable. The EGR cooler is simple, reliable, convenient to use, low in manufacture cost and easy to maintain.

Description

technical field [0001] The invention relates to the field of coolers, in particular to an EGR cooler suitable for exhaust gas recirculation in engine systems. Background technique [0002] At present, EGR refers to the exhaust gas recirculation system. The structure of the EGR cooler is mainly a shell-and-tube type, in which threaded pipes are used for heat exchange, that is, grooves and raised thread grooves are made on the surface of the tube embryo. The structure greatly increases the heat exchange area, thereby greatly improving the heat exchange efficiency of the EGR cooler. [0003] The structure of the shell and tube EGR cooler is as follows: figure 1 As shown, the advantages and disadvantages of its assembly performance are mainly reflected in the brazing process, and the assembly clearance of each part directly affects the brazing effect. At present, the structure of the EGR cooler is machined to ensure the assembly clearance of each part, and its cost is high. Th...

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Problems solved by technology

At present, the structure of the EGR cooler is machined to ensure the assembly clearance of each part, and its cost is high. The connection of the inlet and outlet pipes and the cylinder body by argon arc welding will cause thermal stress and require annealing treatment. At the same time, the existing technology The fixing plate of the middle EGR cooler is flat, and is directly bonded and brazed to the end surface of the cylinder. Since the thickness of the cylinder is generally 1.5mm, in the prior art, the brazing length of the fixing plate and the cylinder is only 1.5mm , the structure has poor strength and low stability, and at the same time, the production efficiency of this structure is relatively low

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