Work Vehicle Exhaust Pipe Segmentation for Temperature Reduction
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Solution Overview
Problem
Existing engine exhaust configurations for work vehicles, such as tractors, face challenges in effectively lowering exhaust temperature due to limitations in increasing the boundary surface area for air mixing without increasing back pressure or complexity, especially when the outlet of the first exhaust pipe is squeezed or made larger.
Innovation Solution
The configuration involves a first exhaust pipe with a partition that divides its outlet into multiple regions and a notch part, positioning the outlet inside the second exhaust pipe's inlet, which increases the boundary surface area by creating multiple flows that mix with outside air, thereby reducing exhaust temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the outlet of the first exhaust pipe is squeezed to increase flow speed, then the temperature lowering effect is improved, but the engine exhaust back pressure increases
Solution Approach 1:
The outlet of the first exhaust pipe is divided into multiple outlets using partitions, creating multiple separate exhaust flows. This segmentation increases the total boundary surface area for air mixing without requiring excessive squeezing of individual outlets, thus improving temperature reduction while controlling back pressure.
2Area of stationary object
If the diameters of the outlet and inlet are increased to increase boundary surface area, then the air mixing effect is improved, but the structure becomes larger and more complicated
Solution Approach 1:
Instead of increasing the diameter of a single outlet, the invention divides the outlet into multiple smaller outlets using partitions. This segmentation approach increases the total boundary surface area for air mixing while maintaining a compact overall structure, avoiding the complexity of larger single outlets.
Solution Approach 2:
The invention introduces a new dimension by adding partitions that divide the outlet cross-section. This dimensional change from a single circular outlet to multiple segmented outlets increases the boundary surface area without significantly increasing the overall pipe diameter or structural complexity.
3Speed
If the outlet of the first exhaust pipe is squeezed too much to increase flow speed, then the ejector effect is improved, but the exhaust back pressure increases excessively
Solution Approach 1:
The outlet is segmented into multiple smaller outlets, which naturally increases flow velocity at each outlet without requiring excessive squeezing. This segmentation achieves the necessary ejector effect for air intake while maintaining reasonable back pressure levels.
Solution Approach 2:
The invention changes the parameter of outlet configuration from a single large outlet to multiple smaller outlets. This parameter change achieves higher flow speeds necessary for the ejector effect while controlling back pressure through the distributed outlet 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 increases the boundary surface area, allowing for efficient mixing of outside air with the engine exhaust, reducing its temperature without increasing back pressure or structural complexity.
Implementation Method 1
When engine exhaust exits from the outlet of the first exhaust pipe and enters the interior of the second exhaust pipe from the inlet of the second exhaust pipe, outside air is drawn into the flow of the engine exhaust due to an ejector effect, brought into the interior of the second exhaust pipe from the inlet of the second exhaust pipe, and mixes with the engine exhaust.
Data Source
AI summary
A work vehicle includes: a first exhaust pipe to which engine exhaust is sent; and a second exhaust pipe that has an inlet having an outer diameter larger than an outlet of the first exhaust pipe, the outlet of the first exhaust pipe and the inlet of the second exhaust pipe being disposed in proximity such that the outlet of the first exhaust pipe is positioned inside the inlet of the second exhaust pipe; a partition that divides a cross section of the outlet of the first exhaust pipe into a plurality of divided regions when viewed from the flow direction and partitions the adjacent divided regions at intervals.