A kind of egr draft tube structure

Abstract

The invention provides an EGR guide pipe structure. The EGR guide pipe structure comprises a guide pipe, a first valve seat and a second valve seat, wherein the first end of the guide pipe is connected with the first valve seat; a connecting hole in the first side of the second valve seat and the second end of the guide pipe are coaxially arranged; the second end of the guide pipe is arranged at one end of the connecting hole, and the other end of the connecting hole is communicated with one end of a necking hole through a first taper hole; the diameter of the necking hole is smaller than that of the connecting hole; the other end of the necking hole is communicated with a ventilation hole through a second taper hole; the diameter of the ventilation hole is greater than that of the connecting hole; the first taper hole, the necking hole, the second taper hole and the ventilation hole are respectively arranged coaxial with the connecting hole; an air outlet communicated with the second taper hole is formed in the second side of the second valve seat; the ventilation hole extends to the side, away from the first side, of the second valve seat, and a sealing plug screw corresponding to the second end is arranged at the end, away from a large opening end, of the ventilation hole. The EGR guide pipe structure provided by the invention can preferably solve the problems of impurity filtering and EGR pipeline drainage.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an EGR guide pipe structure. Background technique [0002] EGR technology (Exhaust Gas Recirculation, exhaust gas recirculation technology), refers to the introduction of part of the exhaust gas after combustion into the intake manifold, and into the cylinder of the engine to participate in the combustion, through the exhaust gas to reduce the combustion temperature in the cylinder and reduce the effect of nitrogen oxides. At the same time, by introducing exhaust gas, it can also optimize the throttle opening and reduce pumping loss, so as to achieve the purpose of reducing fuel consumption. [0003] There are two ways for EGR gas to be drawn out from the exhaust manifold, one is drawn out from before the catalytic converter, and the other is drawn out from behind the catalytic converter. When it is drawn out from behind the catalytic converter, because the gas has been filtered...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of EGR guiding pipe structure, to solve the impurity filtering problem and the draining problem of EGR pipeline when drawing EGR gas from before the catalytic converter

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