Turbulent-flow opposite-impact type Venturi integrated mixer

Abstract

The invention relates to a turbulent-flow opposite-impact type Venturi integrated mixer. The integrated mixer comprises an outer shell, an EGR cross beam, an EGR impeller, a natural gas cross beam and a natural gas impeller, wherein the EGR cross beam and the EGR impeller are fixed to form an EGR core with a Venturi structure; the natural gas cross beam and the natural gas impeller are fixed with the outer shell after being fixed into a whole; air enters a gas channel from an inlet, EGR waste gas passes through a wall-surface round hole of the EGR core and a central gas hole and then enters the gas channel to be mixed with the air, the flow speed of the gas is increased by means of the Venturi structure, mixing is promoted by means of the relationship between the flow speed and pressure, and the gas is subjected to primary rotating mixing after passing through the EGR impeller; and natural gas passes through a wall-surface gas hole of the natural gas cross beam and a central gas groove of the natural gas impeller and then enters the channel to be mixed with the mixed gas obtained after the primary rotating mixing, then new mixed gas is subjected to secondary rotating mixing with under the flow guide effect of the natural gas impeller, the rotating direction of the primary rotating mixing and the rotating direction of secondary rotating mixing are opposite, and mixing is promoted by sudden change of the flow direction of the gas.

Description

technical field [0001] The invention relates to the technical field of natural gas engine intake systems, in particular to a turbulent-flow-contrast type Venturi integrated mixer. Background technique [0002] Exhaust Gas Recirculation (EGR for short) refers to the technology that the internal combustion engine separates a part of the exhaust gas after combustion, and introduces it into the intake side to make it burn again. The main purpose is to reduce the nitrogen oxides (NOx ) and partial load sharing can increase the fuel consumption rate. The oxygen content in the exhaust gas after combustion of the internal combustion engine is extremely low or even non-existent. After the exhaust gas is mixed with the inhalation air, the oxygen concentration in the inhalation air will be reduced, so the following phenomena will occur: the oxygen content lower than the atmosphere is burning When the temperature is lowered, the generation of nitrogen oxides (NOx) will be suppressed. ...

AI Technical Summary

Problems solved by technology

However, the impeller of this patent solution is arranged upstream of the core, which will cause the core to damage the cyclone formed by the impeller, and the streamline shape of the impeller is relatively poor, and the pressure loss is relatively high, which will lead to insufficient air intake of the engine and low engine output power. , the square pores will lead to high addition cost and small effective flow area

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