Direction-changing spray pipe for air inlet passage multi-point injection of dual-fuel engine

Abstract

The invention discloses a direction-changing spray pipe for air inlet passage multi-point injection of a dual-fuel engine and aims to overcome the defect that the natural gas injection direction of a conventional dual-fuel engine is non-changeable in the vertical direction of an axis of an air passage. The direction-changing spray pipe consists of a natural gas spray pipe seat (1), a sealing seat (2), a flow guide pipe (3) and a spray nozzle (4), wherein the bottom end surface of the natural gas spray pipe seat (1) is connected with the top end surface of the sealing seat (2) by adopting a welding mode; the bottom end surface of the sealing seat (2) is connected with the inlet end surface of the flow guide pipe (3) adopting a welding mode; the flow guide pipe outlet end of the flow guide pipe (3) is in threaded connection with a spray pipe inlet (9) of the spray nozzle (4). An injection device inlet (5) in the natural gas spray pipe seat (1) and a rotation axis of a central through hole in the sealing seat (2) are collinear; the central through hole in the sealing seat (2) and a rotation axis on the internal diameter at the inlet end of the flow guide pipe (3) are collinear; the flow guide pipe outlet end of the flow guide pipe (3) and a rotation axis of a spray pipe inlet (9) of the spray nozzle (4) are collinear.

Description

technical field [0001] The invention relates to an injection device belonging to the technical field of natural gas / diesel dual-fuel engine injection, more precisely, the invention relates to a direction-changing nozzle for multi-point injection in the intake port of a dual-fuel engine. Background technique [0002] With the global consumption of petroleum energy, natural gas is increasingly favored by major automakers. The conversion of heavy-duty diesel engines to natural gas / diesel dual-fuel engines can greatly reduce the emission of soot, which can not only alleviate the problem of diesel consumption, but also reduce the problem of high particulate emissions from diesel engines. At present, natural gas / diesel dual-fuel engines generally adopt the way of multi-point injection in the intake port for intake air. The research results show that the natural gas / diesel dual-fuel engine ignites diesel at multiple points, so the concentration distribution of natural gas mixture ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problem that the natural gas injection direction of the existing natural gas / diesel dual-fuel engine is not variable along the vertical direction of the gas channel axis, and to provide a variable-direction nozzle for multi-point injection of the intake port of the dual-fuel engine

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