Air intake mixing device for gas engine

Abstract

The invention relates to the technical field of internal combustion engines, in particular to a gas engine intake mixing device. The intake mixing device is located between a gas fuel and exhaust gasrecirculation (EGR) mixer and an engine intake manifold, and comprises multiple mixing pipelines with the same arrangement direction and connecting pipelines located on two sides of the mixing pipelines, wherein the connecting pipelines are sequentially connected with pipelines between same sides of the different mixing pipelines through flanges so as to form intake mixing gas series connection flow channels; the mixing pipelines are further provided with multiple mixing holes in wall surfaces of flowing directions; and two ends of the mixing holes are connected into the wall surfaces of the different mixing pipelines. According to the intake mixing device provided by the invention, the EGR-gas mixing gas difference of cylinders caused by air, gas fuel and EGR fluctuation can be reduced, the consistency in working of the cylinders of a gas engine is effectively improved, and the stability and the reliability in working of the gas engine are improved.

Description

technical field [0001] The invention belongs to the field of internal combustion engines, and in particular relates to a gas engine intake air mixing device. Background technique [0002] Due to the increasingly serious exhaust pollution of automobiles and various power machinery using petroleum fuel, the living environment of human beings is deteriorating day by day. Therefore, countries have developed alternative energy sources one after another, and gas fuels are clean fuels and are very rich in resources. Therefore, alternative gas fuel engines are widely used, and the market share of various vehicles equipped with gas engines is increasing. [0003] At present, the gas engine is mainly premixed to form an equivalence ratio mixture, which mainly adopts the single-point injection of the intake air. In order to improve the quality of the mixture, a high-efficiency mixer is installed. For the equivalent combustion gas engine, in order to reduce the combustion temperature a...

AI Technical Summary

Problems solved by technology

However, these patents can only make the air, gas fuel and EGR mix very uniformly on the spatial axial section of the intake air passage. In particular, the EGR pipe extracts the combustion exhaust gas from the exhaust manifold. The combustion exhaust gas in the pipe fluctuates periodically, and the periodic fluctuation of the combustion exhaust gas will lead to periodic fluctuations of EGR. In addition, the air and gas fuel often have certain fluctuations, and these fluctuations will lead to periodic fluctuations of the intake air mixture.

Although the mixed gas is uniform on the axial section of the air inlet space, the fluctuation will cause the fluctuation of the mixed gas volume (air, gas fuel, EGR) on different axial sections of the air intake channel due to fluctuations, and the intake valves of different cylinders of the engine will open. , The closing time is different, which will lead to a large difference in the amount of mixed gas (air, gas fuel, EGR) entering each cylinder of the gas engine

In engine air intake, if the amount of EGR and gas mixture entering each cylinder is inconsistent, it will cause a series of problems such as engine misfire, knocking, poor uniformity of each cylinder, and excessive emissions, which will affect the normal operation and reliability of the engine.

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