Series connection type waste gas recycling cooler for medium and heavy duty vehicle

Abstract

The invention relates to a series connection type waste gas recycling cooler for a medium and heavy duty vehicle, which comprises a gas inlet pipe box, a gas exhaust pipe box, at least two heat exchange pipe assemblies, a water inlet pipe and a water outlet pipe, wherein the gas inlet pipe box is connected with a gas exhaust pipe of an engine; the gas exhaust pipe box is connected with a gas exhaust pipe of a waste gas recycling system of the engine; the heat exchange pipe assemblies are respectively connected with the gas inlet pipe box and the gas exhaust pipe box by ridge rings; the water inlet pipe is arranged on the heat exchange pipe assembly connected with the gas inlet pipe box; the water outlet pipe is arranged on the heat exchange pipe assembly connected with the gas exhaust pipebox; and the heat exchange pipe assemblies are connected by heat exchange pipe box connecting elements for connecting gas paths and connected with a water path by water path connecting elements. Theinvention can shorten the lengths of a single pipe shell and a pipe bundle by adopting the heat exchange pipe assemblies, and effectively solve the problem of thermal expansion of the pipe shell and the pipe bundle. The design has simple assembly process, reduces the machining difficulty, improves the machining precision, ensures the reliability of the cooler and standardizes and modularizes the design of a heat exchange pipe and the pipe shell, thereby improving the period of development and reducing the processing difficulty.

Description

technical field [0001] The invention relates to a series exhaust gas recirculation cooler for medium and heavy vehicles, which is a heat exchanger applied to the engine exhaust gas recirculation cooling system of medium and heavy vehicles. Background technique [0002] With the increasingly stringent automobile emission regulations, the application of coolers for engine exhaust gas recirculation cooling systems is becoming more and more extensive. The recirculation cooler needs continuous improvement to meet the requirements of use; for medium and heavy diesel locomotives, the cost of exhaust gas recirculation coolers is higher than that of light diesel locomotive coolers, and the processing is difficult. When manufacturing a cooler, not only its heat transfer performance and reliability must be fully considered, but also the ease of processing and cost must be taken into consideration. [0003] The exhaust gas recirculation cooler is an important component of the exhaust g...

AI Technical Summary

Problems solved by technology

The design of the heat exchange tube assembly of the cooler, the relationship between the tube bundles is in series, the number of tube shells and tube bundles is not corresponding, the number of split tube shells is greater than or equal to the number of tube bundles; the design of the heat exchange tube assembly is effective It solves the thermal stress problem caused by uneven heating of the tube shell and tube bundle, improves the overall reliability of the cooler, and meets the requirements of the engine in terms of performance and reliability, thereby meeting the increasingly stringent emission regulations.

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