Reducing Agent Pipe Routing Through Exhaust Duct
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The temperature increase in the reducing agent supply pipe due to heat from the engine can deteriorate the quality of the reducing agent in work machines equipped with exhaust gas purifying devices.
Innovation Solution
The reducing agent supply pipe is routed through the exhaust duct, where it benefits from natural convection cooling, and a reservoir area is created to maintain cooling water and urea water, preventing temperature rises and potential clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the reducing agent supply pipe is routed through the engine compartment, then it is easy to install and connect to the exhaust gas purifying device, but the temperature of the reducing agent increases due to heat from the engine
Solution Approach 1:
The reducing agent supply pipe is extracted from the engine compartment routing and instead routed through the exhaust duct, separating it from the heat source (engine) while maintaining connection to the exhaust gas purifying device. This resolves the contradiction by removing the pipe from the harmful thermal environment while preserving installation feasibility through the exhaust duct pathway.
Solution Approach 2:
The exhaust duct serves as an intermediary pathway that allows the reducing agent supply pipe to reach the exhaust gas purifying device without being directly exposed to engine heat. The exhaust duct acts as a thermal buffer zone, enabling the pipe to maintain lower temperatures while still fulfilling its functional routing requirement.
2Temperature
If cooling water pipes are used to cool the reducing agent injection device, then the device temperature is reduced, but the system complexity increases
Solution Approach 1:
The cooling function for the reducing agent supply pipe and injection device is merged with the existing exhaust duct structure. The exhaust duct serves dual purposes: as an exhaust pathway and as a cooling channel for the reducing agent components, eliminating the need for separate cooling water pipes and reducing system complexity.
Solution Approach 2:
The exhaust duct naturally cools the reducing agent supply pipe and injection device through passive heat exchange with the exhaust gas flow, without requiring active cooling water circulation systems. The system uses its own operational environment (exhaust gas flow) to provide cooling, reducing the need for additional active cooling components.
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 configuration effectively prevents temperature increases in the reducing agent supply pipe, maintaining the quality of the reducing agent and preventing clogging in the injection device, even after the engine stops.
Implementation Method 1
the reducing agent supply pipe is routed through the exhaust duct, where it benefits from natural convection cooling
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A work machine provided with an exhaust gas purifying device includes a selective catalytic reducing device that performs treatment on exhaust gas of an engine, and a reducing agent injection device that injects a reducing agent into exhaust gas to be supplied to the selective catalytic reducing device. The work machine is provided with a housing that delimits an engine room accommodating the engine and the exhaust gas purifying device. The housing includes a top board that covers the engine room above the engine, and an exhaust duct that is provided in the top board and discharges the air in the engine room to the outside of the engine room. A part of a reducing agent supply pipe for guiding the reducing agent to the reducing agent injection device is disposed in the exhaust duct in a position above the reducing agent injection device.