Exhaust Gas Diffusing Device With Air Director Vortex Mixing
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Solution Overview
Problem
Work vehicles with diesel engines face the challenge of discharging high-temperature exhaust gas after particulate filtration, as existing diffusion techniques either block the gas flow or require increased mixing distances.
Innovation Solution
An exhaust gas diffusing device with air directors positioned in the exhaust pipe or upstream within the outside air mixing cylinder, guiding exhaust gas to whirl along the inner surface for efficient mixing and cooling without blocking the flow or extending the mixing distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a fan is used to rotate and mix exhaust gas with outside air, then the exhaust gas can be diffused and cooled, but the device becomes complex and requires additional power consumption
Solution Approach 1:
The exhaust gas flow itself is utilized to rotate the air director blades, eliminating the need for external power sources or complex mechanical drive systems. The kinetic energy of the exhaust gas is converted into rotational motion to achieve mixing and cooling, making the system self-powered and simpler in structure
Solution Approach 2:
The invention uses the pneumatic flow of exhaust gas to drive the mixing mechanism. The high-velocity exhaust gas creates a vortex that rotates the air director, utilizing fluid dynamics principles to achieve cooling and mixing without mechanical fans or motors
2Temperature
If guide vanes are used to increase exhaust gas flow speed, then cooling efficiency improves, but the exhaust gas flow is partially blocked
Solution Approach 1:
The air director is positioned at an angle relative to the exhaust gas flow direction, creating a three-dimensional vortex flow pattern. This angular arrangement allows the exhaust gas to rotate and mix with outside air without being blocked, converting linear flow into rotational flow to enhance cooling while maintaining flow rate
Solution Approach 2:
The invention changes the flow parameters by introducing rotational motion to the exhaust gas. The air director blades are angled to convert the axial exhaust flow into a swirling vortex, changing the velocity vector and creating centrifugal forces that draw in outside air for mixing, thereby improving cooling efficiency without blocking the flow
3Temperature
If the mixing/discharging pipe diameter is larger than the exhaust pipe, then exhaust gas diffusion is improved, but the overall device size increases
Solution Approach 1:
The invention uses dynamic vortex flow generated by the rotating air director to enhance exhaust gas diffusion within a compact cylindrical chamber. The rotational motion creates intense mixing and draws in outside air, achieving effective diffusion without requiring a large expansion of the pipe diameter, thus maintaining a compact overall device volume
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
Effectively cools exhaust gas by promoting mixing with outside air, reducing pressure loss and allowing for compact design without blocking the exhaust gas flow, thus efficiently dissipating heat.
Implementation Method 1
guiding exhaust gas to whirl along the inner surface for efficient mixing and cooling
Implementation Method 2
effectively cools exhaust gas by promoting mixing with outside air, efficiently dissipating heat
Implementation Method 3
exhaust gas to be mixed with outside air introduced through an outside air introducing section
Data Source
Figure 1
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AI summary
The present invention provides an exhaust gas diffusing device that cools exhaust gas from an exhaust pipe and that does not block the flow of exhaust gas. An exhaust gas diffusing device A includes: an outside air mixing cylinder (11) having an inner diameter larger than the outer diameter of a discharge-side end portion (6E) of an exhaust pipe (6) configured to send out exhaust gas of an engine of a vehicle, the outside air mixing cylinder (11) positioned to receive the exhaust gas from the exhaust pipe (6), and configured to receive outside air to be mixed with the exhaust gas; and at least one air director (13) disposed (i) at a position on the outside air mixing cylinder (11) which position is upstream in a direction in which the exhaust gas flows or (ii) in the exhaust pipe (6) to promote the mixing. (Fig. 4)