Mixing device for vehicle engine exhaust gas recirculation (EGR)

Abstract

The invention discloses a mixing device for a vehicle engine exhaust gas recirculation (EGR). The mixing device comprises a gas inlet pipe, an exhaust gas pipe, a flow guide shell and an exhaust gas flow guide device, wherein the exhaust gas flow guide device comprises a first flow guide plate, a second flow guide plate, a front exhaust gas passage, a lateral exhaust gas passage and a back exhaust gas passage; one end of the first flow guide plate and one end of the second flow guide plate are connected with the outer wall of the gas inlet pipe, and the other ends of the first flow guide plate and the second flow guide plate are connected with the inner wall of the flow guide shell; a small cavity port of the gas inlet cavity between the first flow guide plate and the second flow guide plate is communicated with the exhaust gas pipe, and a large cavity port of the gas inlet cavity is opposite to the front exhaust gas passage; a part of the gas inlet pipe opposite to the front exhaust gas passage is provided with the back exhaust gas passage; the lateral exhaust gas passage is formed between the front exhaust gas passage and the back exhaust gas passage; the front exhaust gas passage is smaller than the lateral exhaust gas passage; and the lateral exhaust gas passage is smaller than the back exhaust gas passage. According to the mixing device, the uniformity of mixing of exhaust gas and inlet gas can be improved, the stability of operation of an engine is enhanced, the gas inlet pressure loss is small, the structure is simple, and the manufacturing is convenient.

Description

technical field [0001] The invention relates to a gas mixing device, in particular to a mixing device for vehicle engine exhaust gas recirculation (EGR), which is particularly suitable for improving the uniformity of exhaust gas and intake air mixing. Background technique [0002] At present, exhaust gas recirculation EGR (Exhaust Gas Recirculation) is to reduce the harmful emission of NO from vehicle engines. X As one of the effective measures, EGR technology has been widely used in vehicle engines at home and abroad. As the requirements of vehicle emission indicators become more and more stringent, more and more attention is paid to the research of EGR technology. [0003] Exhaust gas recirculation is to send part of the exhaust gas discharged from the engine back to the intake pipe according to the temperature and load of the engine under the premise of ensuring that the power performance of the engine is not significantly reduced, and then enter the cylinder again after ...

AI Technical Summary

Problems solved by technology

[0006] First of all, the exhaust pipe in this invention is not perpendicular to the diversion shell, and there is an acute angle between the exhaust pipe and the diversion shell. The existence of this angle will cause the exhaust gas to flow in an oblique direction in the intake pipe, thereby reducing the The uniformity of exhaust gas and intake air mixing;

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