Reducing agent delivery device with compensation element, method for compensating freezing of a reducing agent in a delivery device and motor vehicle having a delivery device

摘要

A delivery device for delivering liquid reducing agent includes a reducing agent tank. At least a delivery unit, at least one first compensation element, a reducing agent line and a metering unit together have an overall volume to be filled with a reducing agent and are configured for delivering, conducting and metering the reducing agent from the reducing agent tank. The at least one first compensation element is configured for reducing the overall volume when a negative pressure occurs in the delivery device. A method for compensating freezing of a reducing agent in a delivery device and a motor vehicle having a delivery device, are also provided.

主权项

1. A delivery device for delivering liquid reducing agent, the delivery device comprising:
a reducing agent tank; and a delivery unit for delivering liquid reducing agent, at least one first compensator for compensating changes in volume, a reducing agent line and a metering unit for metering liquid reducing agent; at least said delivery unit, said at least one first compensator, said reducing agent line and said metering unit together having an overall volume to be filled with a reducing agent and being configured for delivering, conducting and metering the reducing agent from said reducing agent tank; said at least one first compensator being configured for reducing said overall volume when a negative pressure occurs in the delivery device as a result of a reduction of volume in the reducing agent during cooling of the reducing agent prior to freezing of the reducing agent; said at least one first compensator being configured to permit no significant increase in said overall volume when a positive pressure prevails in the delivery device; and a contact surface, said at least one first compensator including a diaphragm disposed on said contact surface, said contact surface having a bore formed therein within an area of said diaphragm, said bore for allowing air to contact the diaphragm and deflect the diaphragm when a negative pressure prevails in delivery device.