Work Vehicle Injection Device Heat Shield Design
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Solution Overview
Problem
The heat generated by diesel particulate filtering and selective catalyst reduction devices in wheel loaders and other work vehicles causes the injection device to degrade, particularly when using urea aqueous as a reducing agent, which changes to ammonia and further reduces the durability of the injection system.
Innovation Solution
A partitioning member with first and second partition parts is strategically positioned between the injection device and the diesel particulate filtering and selective catalyst reduction devices, respectively, to block radiant heat, and the injection device is disposed between the connecting pipe and a vehicle cover to prevent temperature rises, ensuring effective mixing of the reducing agent with exhaust gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a selective catalyst reduction device is added to the exhaust gas post-processing system, then nitrogen oxide purification is improved, but the injection device temperature rises causing durability degradation
Solution Approach 1:
A partitioning member is introduced as an intermediary element between the injection device and the exhaust gas post-processing devices (diesel particulate filter and selective catalyst reduction device). This partitioning member blocks radiant heat from reaching the injection device, thereby protecting the sealing materials and other heat-sensitive components from thermal degradation while allowing the exhaust gas purification system to operate effectively.
2Productivity
If the injection device is positioned close to the exhaust gas path for efficient reducing agent injection, then injection efficiency is improved, but the device is exposed to high temperatures causing sealing material degradation
Solution Approach 1:
The engine room is segmented into different zones using partitioning members. The injection device is positioned in a zone that is spatially separated from the high-temperature exhaust gas post-processing devices. This segmentation allows the injection device to maintain close proximity to the exhaust gas path for efficient reducing agent injection while being protected from excessive heat exposure by the partitioning structure.
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 the injection device from overheating, maintaining its durability and ensuring efficient operation by blocking radiant heat from both devices and ensuring thorough mixing of the reducing agent with exhaust gas.
Implementation Method 1
The first partition part is disposed between the injection device and the diesel particulate filtering device. The second partition part is disposed between the injection device and the selective catalyst reduction device. Radiant heat radiating from the diesel particulate filtering device to the injection device can be blocked by the first partition part. Radiant heat radiating from the selective catalyst reduction device to the injection device can be blocked by the second partition part.
Data Source
AI summary
A work vehicle includes an engine, an exhaust gas post-processing device, an engine room and a partitioning member. The exhaust gas post-processing device includes a diesel particulate filtering device, a selective catalyst reduction device, a connecting pipe connecting the diesel particulate filtering and the selective catalyst reduction device, and an injection device configured to inject a reducing agent into the connecting pipe. The engine room accommodates the engine and the exhaust gas post-processing device. The partitioning member includes a first partition part disposed between the injection device and the diesel particulate filtering device, and a second partition part disposed between the injection device and the selective catalyst reduction device.