A kind of egr mixing device

Abstract

The invention relates to the field of mixing devices, and discloses an EGR mixing device. The EGR mixing device comprises an EGR mixer, an EGR pipe and an air inlet pipe. The EGR mixer comprises an annular hollow shell. An inlet is formed in the outer wall of the hollow shell. A plurality of outlets are distributed in the inner wall of the hollow shell in the circumferential direction. An airflow channel is formed by a cavity of the hollow shell. The air inlet pipe comprises a first air inlet pipe body and a second air inlet pipe body which are connected to the two ends of the hollow shell correspondingly. The EGR mixer communicates with the first air inlet pipe body and the second air inlet pipe body through the multiple outlets. The inner diameter of the hollow shell is matched with the inner diameter of the first air inlet pipe body and the inner diameter of the second air inlet pipe body. The EGR pipe is connected with the inlet of the hollow shell. By means of the EGR mixing device, EGR mixing evenness can be improved, and the low air inlet resistance can be guaranteed as well.

Description

technical field [0001] The present invention relates to the technical field of mixing devices, in particular to an EGR mixing device. Background technique [0002] With the escalation of emission regulations, EGR (Exhaust Gas Recirculation) technology is an effective way to control NO x The means of emission are widely used in diesel engines. Part of the exhaust gas is introduced from the exhaust pipe into the intake pipe through an EGR pipeline, but after the exhaust gas is directly introduced into the intake pipe, it often cannot be effectively mixed with the fresh air (especially for models with a short mixing distance), resulting in a large amount of exhaust gas entering each cylinder. The same, which will lead to the deterioration of combustion, increased emissions and other consequences, affecting the performance of the whole machine. [0003] In order to improve the mixing of EGR exhaust gas and fresh air and improve the uniformity of EGR distribution in each cylind...

AI Technical Summary

Problems solved by technology

Part of the exhaust gas is introduced from the exhaust pipe into the intake pipe through an EGR pipeline, but after the exhaust gas is directly introduced into the intake pipe, it often cannot be effectively mixed with the fresh air (especially for models with a short mixing distance), resulting in different amounts of exhaust gas entering each cylinder. The same, which in turn leads to combustion deterioration, increased emissions and other consequences, affecting the performance of the whole machine

[0003] In order to improve the mixing of EGR exhaust gas and fresh air and improve the EGR distribution uniformity of each cylinder, various EGR mixing devices have been designed. At the same time, the intake resistance will increase and the pressure loss will be high; however, the uniformity of EGR mixing will become worse after the pressure loss is reduced, and it is difficult to find a balance point with good effects between pressure loss and EGR mixing uniformity

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