DOSING SYSTEM FOR A LIQUID REDUCING AGENT

摘要

Proposed is a dosing module for injecting liquid urea-water solution into the exhaust tract of an internal combustion engine, which dosing module is composed of two pumps, specifically a delivery pump (5) and an aeration pump (15). This permits firstly the injection of urea-water solutions and secondly safe and reliable ventilation of the system when the internal combustion engine is to be shut down.

主权项

1. A dosing system for urea-water solution including a delivery module comprising a delivery pump (5), a dosing module (9) and a tank (1), the delivery pump having a suction side and a delivery side, wherein the delivery pump (5) and the tank (1) are connected to one another via a suction line (3) and wherein the delivery pump (5) and the dosing module (9) are connected to one another via a pressure line (7), characterized in that an aeration pump (15) is disposed parallel to the delivery pump (5), wherein the aeration pump has a suction side and a delivery side, and wherein the aeration pump (15) is connected to the dosing module (9) on the suction side of the aeration pump and to the tank (1) on the pressure side of the aeration pump.