Urea pump assembly for an exhaust gas treatment system

Abstract

Exemplary embodiments of the present invention are directed towards improved systems and methods for the delivery of urea to an exhaust gas treatment system. In one exemplary embodiment, a urea pump assembly for an exhaust treatment system is provided. The pump assembly includes a housing comprising: a housing chamber, a first fluid inlet and a first fluid outlet, the first fluid inlet being in fluid communication with the first fluid outlet through a first conduit. The housing also comprises a second fluid inlet and a second fluid outlet, the second fluid inlet being in fluid communication with the second fluid outlet through a second flexible conduit. The second flexible conduit is located within a portion of the housing chamber and in thermal communication with the first conduit. The pump assembly also includes a pump located within the housing chamber, the pump being engaged with the second conduit and configured to move fluid between the second fluid inlet and the second fluid outlet.

Description

FIELD OF THE INVENTION[0001]Exemplary embodiments of the present invention are directed towards improved systems and methods for the delivery of a urea solution to an exhaust gas treatment system.BACKGROUND[0002]Exhaust emission control has been and will continue to be of interest as effects of emissions from stationary and transient emission generating devices are continually being understood. This, along with government mandates, have caused manufacturers of emission generating devices, particularly internal combustion engines, to develop methods and devices for controlling the content of emissions emanating from such devices. In one particular sector, due to the advantage of diesel burning engines over gasoline burning engines, advancements of emission control for diesel engines are continuingly being sought. These advancements include emission control devices configured for removing particulate matter from an exhaust gas stream and / or converting certain exhaust gases, such as NO...

AI Technical Summary

Benefits of technology

[0006]Exemplary embodiments of the present invention provide improved systems and methods for the delivery

Problems solved by technology

However, during certain operation conditions, such as extreme cold temperatures, the ammonia or urea solution may become frozen, thereby causing a loss in the ability to inject the solution into the exhaust gas stream.

While certain injection systems have been provided for the introduction of urea, few systems contemplate the addition of heat for prevention o

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