Device and method for dosing and transporting dry urea, especially during the implementation of the SCR method in motor vehicles

US7770383B2 · kind B2 · utility

Assignee

• VOLKSWAGEN AKTIENGESELLSCHAFT · DE

Inventors

• Sebastian Kaefer · Stuttgart, DE
• Werner H. Mueller · Port Aransas, US
• Andreas Herr · Wolfsburg, DE
• Andreas Lacroix · Weidenthal, DE

Key dates

• Filing date: Oct 31, 2003
• Grant date: Aug 10, 2010
• Expiry date: Aug 2, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

In a device for dosing and transporting dry urea, e.g., for implementing the SCR method in a motor vehicle, the device includes a storage vessel containing the dry urea in the form of pellets, the wall of the storage vessel having an opening to which a transport line is connected on the outer side. The device also includes a compressed air nozzle which is arranged inside the storage vessel at a distance from the opening, is oriented towards the opening, and may be supplied with compressed air, and a portioning element having an upper side oriented towards the inside of the storage vessel and a lower side opposite the wall of the storage vessel. At least one continuous channel having a larger cross section than the dimensions of the pellets connects the upper side and the lower side in order to form at least one receiving element for the pellets.