Heat exchange tube structure capable of eliminating cold shrinkage and thermal expansion damage effects and modularized cooler

Abstract

The invention relates to a heat exchange tube structure capable of eliminating cold shrinkage and thermal expansion damage effects and a modularized cooler. The heat exchange tube structure comprisesmultiple sections of heat exchange tube groups, the heat exchange tube groups are connected through small tube sheets, a plurality of edge protrusions are arranged on the circumferences of the small tube sheets, and the edge protrusions are connected with a tube shell. According to the heat exchange tube structure, the heat exchange tubes are combined section by section through the small tube sheets, and the small tube sheets are connected with the tube shell, so that the whole telescoping length of the heat exchange tubes is reduced, and uncertain deformations of the heat exchange tubes are avoided. By using the characteristic that the small tube sheets are segmented, the heat exchange tube groups, manufacturing of the tube shell and other parts of the cooler is standardized and modularized, and the production cost of heavy type EGR coolers is reduced.

Description

technical field [0001] The invention relates to a heat exchange tube structure and a modularized cooler for eliminating the destruction effect of thermal expansion and cold contraction, and is a heat exchange tube structure of a cooler used in an EGR system of an automobile engine. Background technique [0002] With the continuous upgrading of automobile emission standards, exhaust gas recirculation systems have been widely applied to light-duty diesel engines, but at present, medium and heavy-duty diesel , it is difficult to meet the emission requirements by using SCR technology alone, and the position of EGR technology in medium and heavy-duty engines has become increasingly important. Compared with light-duty engines, medium- and heavy-duty engines have a large exhaust gas flow, requiring EGR coolers to have higher heat transfer The volume of the cooler is greatly increased, and the internal heat exchange unit is longer. When the cooler is working, the thermal expansion a...

AI Technical Summary

Problems solved by technology

[0002] With the continuous upgrading of automobile emission standards, exhaust gas recirculation systems have been widely applied to light-duty diesel engines, but at present, medium and heavy-duty diesel , it is difficult to meet the emission requirements by using SCR technology alone, and the position of EGR technology in medium and heavy-duty engines has become increasingly important. Compared with light-duty engines, medium- and heavy-duty engines have a large exhaust gas flow, requiring EGR coolers to have higher heat transfer The volume of the cooler is greatly increased, and the internal heat exchange unit is longer. When the cooler is working, the thermal expansion and contraction of the shell and the heat exchange core are different, forming axial stress, which can easily cause the two ends of the main board and the exchange Problems such as cracking at the welding seam at the end of the heat unit or bending and fracture of the heat exchange unit seriously affect the reliability of the EGR cooler

[0003] At present, there are two kinds of solutions, one is to add bellows at the intake end of the EGR cooler to compensate the thermal expansion of the heat exchange unit through the bellows; the other is to add corrugated structures on the cooler tube shell , to eliminate the thermal stress caused by the difference in thermal deformation during the work of the cooler through the corrugated structure on the tube shell; the disadvantages of these two methods: increase the corrugated structure, occupy the space of the heat exchange unit, and affect the EGR cooler. Thermal efficiency, adding bellows means adding a part, and it is necessary to match bellows with different pipe diameters and different corrugated parameters according to the structural size of the product. The versatility of the parts is poor, resulting in an increase in the cost of the product

[0004] Compared with light-duty EGR coolers, medium- and heavy-duty EGR coolers are generally large in size and complex in structure, and many parts need to be developed and manufactured. The batches of medium and heavy-duty EGR coolers are small, and the versatility of parts in multi-engine models is poor. , causing the cost of medium and heavy EGR coolers to remain high

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