Injection apparatus for injecting reducing agent e.g. ammonia, into off-gas treatment device for cleaning exhaust gas of internal combustion engine in motor car, has compensation element compensating freezing pressure in supply line

摘要

#CMT# #/CMT# The apparatus (1) has an injector (3) and a supply line (4) for providing reducing agent e.g. ammonia, to the injector. A compensation element (5) is arranged between the supply line and the injector for compensating the freezing pressure in the supply line. The injector, the supply line and the compensation element are connected in a rigid manner. The compensation element comprises a chamber having variable volume, where the volume changes if the pressure in the chamber lies above a threshold value. The compensation element comprises an elastic element e.g. spring and compressible fluid. #CMT#USE : #/CMT# Injection apparatus for injecting a reducing agent e.g. ammonia, into an off-gas treatment device for cleaning exhaust gas of an internal combustion engine in a motor car (all claimed). #CMT#ADVANTAGE : #/CMT# The compensation element is arranged between the supply line and the injector for compensating the freezing pressure in the supply line, so that the increase of the volume of the chamber due to the freezing of the agent is eliminated, thus avoiding damage to a dosing system. The compensation element comprises the elastic element for realizing a variable volume in the chamber, so that the resetting force can be exploited during reduction of frozen reducing agent. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a schematic side view of an injection apparatus. 1 : Injection apparatus 3 : Injector 4 : Supply line 5 : Compensation element.