Urea Pipe Cooling via Engine Compartment Airflow
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Solution Overview
Problem
The existing cooling structures for urea aqueous solution pipes in exhaust gas aftertreatment devices are costly and complex, and enlarging the inlet for cooling air to improve cooling performance increases environmental noise.
Innovation Solution
A cooling structure for urea aqueous solution pipes that incorporates a pipeline-forming member in the engine compartment, where the urea aqueous solution pipe is arranged within the pipeline, and cooling air flows through the pipeline or an adjacent insulation space, reducing the need for large air intake holes and thus minimizing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooler is provided in the supply pipe or return pipe, then cooling performance is improved, but device complexity and production cost increase
Solution Approach 1:
The patent merges the cooling function with the existing pipe structure by forming the pipeline directly within the engine compartment where cooling air naturally flows. This eliminates the need for separate coolers while maintaining effective cooling of the urea aqueous solution pipe, thereby reducing device complexity and production cost while preserving cooling performance.
2Temperature
If the opening area of the inlet is enlarged to supply more cooling air, then cooling performance is improved, but environmental noise increases
Solution Approach 1:
The patent utilizes the existing cooling air flow within the engine compartment to cool the urea aqueous solution pipe. The pipe is positioned to naturally receive cooling air that is already being circulated for engine cooling purposes, eliminating the need to create additional air intake openings. This self-service approach maintains effective cooling while avoiding the generation of additional environmental noise.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively cools the urea aqueous solution at a lower production cost while reducing environmental noise by utilizing existing cooling air flows within the engine compartment, thereby preventing deterioration of the urea solution.
Implementation Method 1
cooling air sucked by the cooling fan flows in the pipeline
Implementation Method 2
the urea aqueous solution pipe supplying the urea aqueous solution to the selective catalytic reduction device through the engine compartment
Data Source
AI summary
In a working vehicle, an exhaust gas aftertreatment device is provided in an engine compartment that is adjacent to a cooling fan through which cooling air is supplied to a heat exchanger. The exhaust gas aftertreatment device includes a selective catalytic reduction device in which ammonia obtained from a urea aqueous solution is used as a reduction-causing agent. A urea aqueous solution pipe through which the urea aqueous solution is supplied is laid to the selective catalytic reduction device through the engine compartment. In the engine compartment, a pipeline-forming member having pipelines in which the urea aqueous solution pipe is installed. The cooling air sucked by a cooling fan flows into the pipelines.