Patent ID: 7571603
Filing Date: 2009-08-11
Classification: B01D,B05B,F01N,Y02A,Y02T

Abstract:
1. A metering system for metering fluid, pollutant-reducing media, in particular aqueous urea solutions, into a motor vehicle exhaust system, the system comprising, at least one supply container for storing at least one fluid, pollutant-reducing medium, at least one metering pump communicating with the at least one supply container, and at least one self-opening nozzle, communicating with the at least one metering pump directly or via a pipeline system, the self-opening nozzle having at least one supply opening for the delivery of fluid media, and at least one nozzle opening, and the at least one nozzle opening being embodied such that through the at least one nozzle opening, fluid media can be injected into the motor vehicle exhaust system, wherein the at least one self-opening nozzle comprises, a nozzle body with a spring chamber and a needle chamber, the needle chamber having at least one supply opening for the delivery of fluid media and at least one nozzle opening and at least one nozzle needle supported movably in the needle chamber in such a way that the at least one nozzle needle, in at least one position, tightly closes the at least one nozzle opening for fluid media and, in at least one further position, opens the nozzle opening for fluid media, at least one spring element in the spring chamber and exerting a force on the at least one nozzle needle, in such a way that without the exertion of additional forces, the at least one nozzle needle tightly closes the at least one nozzle opening for fluid media, and at least one sealing element preventing or reducing a penetration of fluid media from the at least one needle chamber into the at least one spring chamber.