Conveying unit for a reducing agent
View Patent ↗A conveying unit for conveying reducing agent from a tank to an exhaust gas treatment device for treating the exhaust gases from an internal combustion engine, includes a pump having a drive or drive unit and a pump chamber unit or containment. The pump chamber unit or containment at least partly delimits a pump chamber and the drive or drive unit and the pump chamber unit or containment are detachable from one another.
1. A conveying unit for conveying reducing agent from a tank to an exhaust gas treatment device for treating exhaust gases from an internal combustion engine, the conveying unit comprising:
a pump having a drive and a pump chamber containment;
said drive and said pump chamber containment being detachably interconnected;
said pump chamber containment at least partly delimiting a pump chamber; and
a controller configured to operate said pump for a test run with minimal driving power to determine if frozen reducing agent present in the conveying unit is impeding operation of said pump.
2. The conveying unit according to claim 1 , which further comprises a flange, said drive being fastened to said flange, and said pump chamber containment being at least partly formed by said flange.
3. The conveying unit according to claim 1 , which further comprises a pump diaphragm separating said pump chamber containment and said drive.
4. The conveying unit according to claim 3 , wherein said pump chamber containment is constructed in the form of a half shell and said pump chamber is delimited by said pump chamber containment and by said pump diaphragm.
5. The conveying unit according to claim 1 , wherein said pump chamber has a chamber volume configured to be reduced during a pumping procedure to a dead volume, and said dead volume is less than 20% of said chamber volume.