Heat exchanger for a metering unit of an SCR exhaust-gas aftertreatment device

摘要

The invention relates to a heat exchanger (50) for a dosing unit of an SCR (selective catalytic reduction) exhaust gas treatment device (10), wherein an adjustable volume of a fluid can be discharged by a dosing unit into an exhaust gas system (177) of an internal combustion engine (155). The heat exchanger (50) has at least one fluid channel (52) through which air can flow, wherein said fluid channel (52) is routed around at least a subregion of an outer peripheral wall (54) of a dosing valve (34) of the dosing unit (100).;In a further aspect, the invention relates to an SCR dosing unit (100) having a heat exchanger (50) according to the invention, wherein an air intake system (78) is arranged on the dosing unit (100), such that it is possible for air to be conveyed into the heat exchanger (50) during operation of the internal combustion engine (155). Finally, an exhaust gas treatment device (10) for an internal combustion engine (155) is suggested which is particularly suited for a vehicle engine, and preferably a diesel engine, and which has a dosing unit according to the invention.

主权项

1. A heat exchanger for a dosing unit of an SCR (selective catalytic reduction) exhaust gas treatment device, wherein the dosing unit is structured to discharge an adjustable volume of fluid into an exhaust gas system of an internal combustion engine, and wherein the heat exchanger has at least one air flow channel directing a flow of air, and said channel is routed around at least a subregion of an outer peripheral wall of a dosing valve of the dosing unit, wherein the channel defines a helical flow path including a flow directing heat transfer surface winding around the outer peripheral side wall of the dosing valve.