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Urea solution pump with leak bypass

A technology of urea and solution, which is applied in the direction of pumps with flexible working elements, pumps, liquid displacement machines, etc.

Active Publication Date: 2016-04-20
CUMMINS EMISSION SOLUTIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is a long felt unmet need to facilitate the reduction of these or other disadvantages associated with SCR systems employing urea solutions

Method used

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  • Urea solution pump with leak bypass
  • Urea solution pump with leak bypass
  • Urea solution pump with leak bypass

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Embodiment Construction

[0015] For a better understanding of the nature of the present invention, specific language will be referred to and described with respect to the embodiments shown in the drawings. It is to be understood, however, that these are not limitations on the scope of the invention and that any alternatives and further modifications to the illustrated embodiments and further applications of the essence of the invention described herein are within the skill of the art personnel are predictable.

[0016] refer to figure 1 , exemplarily shows a system 100 for injecting urea solution into an SCR exhaust aftertreatment system. The system 100 may be provided on a vehicle powered by an engine such as a diesel engine, or it may be an engine powered vehicle employing other means, such as electric or pump systems. System 100 includes pump 134 that draws urea solution from tank 140 through strainer 138 and check valve 136 . A preferred urea solution is urea for vehicles (DEF), which contains ...

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Abstract

Urea solution pumps having leakage bypass flowpaths and methods of operating the same are disclosed. Certain embodiments are pump apparatuses including an inlet passage in flow communication with a source of urea solution and a pump chamber, an outlet passage in flow communication with the pump chamber and an exhaust after treatment system, a diaphragm facing the pump chamber and coupled with an actuator, a first housing member coupled with a second housing member form a seal around the pumping chamber, a leak collection chamber surrounding the seal, and a return passage in flow communication with the leak collection chamber and the inlet passage. Urea solution that leaks from the pump chamber past the seal is received by the leak collection chamber and flows through the return passage to the pump inlet passage.

Description

[0001] priority [0002] The current application claims priority and benefit to US Provisional Patent Application Serial No. 61 / 526,102, filed August 22, 2011, which is hereby incorporated by reference in its entirety. technical background [0003] Selective catalytic reduction (SCR) exhaust aftertreatment systems are an important technology for reducing NOx emissions from internal combustion engines such as diesel engines. SCR systems generally include: a source of urea solution, a pump unit for pressurizing the urea solution, a metering unit for supplying a controlled amount or rate of urea solution to the SCR catalyst, an exhaust to the upstream of the SCR catalyst The urea decomposition region of the gas path provides an injector for the urea solution. Many SCR systems also employ pressurized gas to assist the flow of urea solution to the injectors. While it can significantly reduce NOx emissions, the SCR system also has some shortcomings and problems. Using a urea solu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B15/00
CPCF01N3/2066F01N2610/02F01N2610/146F04B43/02Y02T10/12Y10T137/0391Y10T137/0396Y10T137/7836Y10T137/86815Y10T137/87676Y10T137/87684F01N3/208F01N2610/00F16K7/12F16K11/10
Inventor G·芒蒂恩N·帕沃K·伊纳拉S·霍尔S·阿普金C·戈瑟林A·迈尔J·F·伯克J·海彻尔贝赫
Owner CUMMINS EMISSION SOLUTIONS