Gas mixing device for engine exhaust gas recycling system

Abstract

The invention provides a gas mixing device for an engine exhaust gas recycling system, and relates to a gas mixing device. The gas mixing device comprises an air circulation pipe and a gas mixing pipe communicated with an EGR valve; one end of the air circulation pipe is communicated with an air inlet pipe, the other end of the air circulation pipe is communicated with a compressor of a supercharger, and the air circulation pipe is used for receiving air flowing in from the air inlet pipe; the gas mixing pipe is arranged outside the air circulation pipe in a sleeving manner so as to receive exhaust gas exhausted from an engine and flowing through the EGR valve; the air circulation pipe is provided with a plurality of air inlet holes and a plurality of air exhaust holes, and therefore air flows into the gas mixing pipe from the air inlets, the air and exhaust gas are mixed to form mixed gas, and the mixed gas is exhausted to the compressor; and the gas mixing pipe is provided with the gas inlet end communicated with the EGR valve, an included angle is formed between the gas inlet end and the gas mixing pipe, and therefore the mixed gas does helical motion in the axis direction of the air circulation pipe. The gas mixing device solves the problem that the exhaust gas and fresh air are insufficiently mixed.

Description

technical field [0001] The invention relates to a gas mixing device, in particular to a gas mixing device used in an exhaust gas circulation system of an engine. Background technique [0002] EGR technology is exhaust gas recirculation technology, which is an exhaust purification device for harmful gases. It mixes a part of the exhaust gas with fresh air and enters the cylinder for combustion to increase the heat capacity of the mixture, reduce the maximum temperature during combustion, and suppress the generation of harmful gases. EGR technology plays an important role in engine fuel saving and emission reduction. With the increasingly stringent fuel consumption and emission regulations, the application of EGR technology in supercharged gasoline engines has gradually become a trend. The addition of EGR technology to gasoline engines will inevitably become It is a mainstream of engine technology upgrade of major OEMs. [0003] The most widely used in the prior art is the l...

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Problems solved by technology

[0004] An object of the present invention is to provide a gas mixing device for the exhaust gas circulation system of an engine to solve the problem that the exhaust gas and air of EGR are not mixed sufficiently, thus affecting the stability of the compressor

[0006] Another further object of the present invention is to solve the problem that the exhaust gas flow discharged by the EGR system cannot meet the engine demand due to insufficient pressure difference

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