Exhaust Device Inner Outer Cone Stack Assembly Back-Pressure Reduction
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Solution Overview
Problem
Current diesel particulate filters (DPFs) and mufflers fail to simultaneously reduce soot particles and noise emissions from diesel engines, leading to back-pressure issues that decrease horsepower and fuel efficiency.
Innovation Solution
An exhaust device with an inner cone stack assembly and outer cone stack assembly, featuring diverter frustums and baffle frustums, which are designed to reduce soot particles and noise while minimizing back-pressure, using a combination of radial tapers and self-supporting structures, and optionally coated with nickel for enhanced strength and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a diesel particulate filter is used to reduce soot particles, then particle emission is reduced, but back-pressure increases and horsepower decreases
Solution Approach 1:
The exhaust system is segmented into multiple functional zones: an inner cone stack with spiral channels for particle impingement, an outer cone stack with baffle frustums for noise attenuation, and a diverter frustum for flow distribution. This segmentation allows each zone to perform its specific function without creating excessive back-pressure, as the spiral flow pattern maintains continuous exhaust gas movement while capturing particles.
Solution Approach 2:
The inner cone stack assembly is nested within the outer cone stack assembly, with the inner cone having spiral channels and the outer cone having baffle frustums. This nested configuration allows particle impingement to occur in the inner cone while noise attenuation occurs in the outer cone, achieving both particle reduction and noise control without requiring separate devices that would increase back-pressure.
2Object-affected harmful factors
If a muffler is used to attenuate noise, then noise emission is reduced, but back-pressure increases and fuel efficiency decreases
Solution Approach 1:
The baffle frustums in the outer cone stack are designed with specific local geometries including tapered sections and radial partitions that create localized noise attenuation zones. These local structures attenuate noise through sound interference and absorption while maintaining adequate flow passages to minimize back-pressure and energy loss.
Solution Approach 2:
The noise attenuation function is moved from a separate axial component to a radial configuration within the outer cone stack. The baffle frustums extend radially outward to create noise attenuation pathways that do not obstruct the main exhaust flow axis, thereby reducing back-pressure while still achieving noise reduction through multi-directional sound wave interference.
3Object-affected harmful factors
If separate devices are used for particle reduction and noise attenuation, then both functions are achieved, but device complexity and back-pressure increase
Solution Approach 1:
The particle impingement function (inner cone stack with spiral channels) and noise attenuation function (outer cone stack with baffle frustums) are merged into a single integrated exhaust device. The concentric arrangement of inner and outer cones with their respective functional channels creates a compact unified structure that performs both particle reduction and noise attenuation simultaneously, reducing overall system complexity compared to separate DPF and muffler assemblies.
Solution Approach 2:
The exhaust device is designed as a universal component that simultaneously performs multiple functions: particle impingement through spiral flow, noise attenuation through baffle frustums, and exhaust gas redirection through the diverter frustum. This multi-functional design eliminates the need for multiple separate devices, reducing both device complexity and back-pressure while achieving comprehensive pollution reduction.
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
The exhaust device effectively reduces both air and noise pollution with minimal back-pressure, improving engine performance and fuel efficiency by using concentrically aligned cone assemblies and baffle frustums that optimize particle impingement and sound interference.
Implementation Method 1
an inner cone stack assembly and outer cone stack assembly, featuring diverter frustums and baffle frustums, which are designed to reduce soot particles and noise
Implementation Method 2
concentrically aligned cone assemblies and baffle frustums that optimize particle impingement
Implementation Method 3
baffle frustums that optimize particle impingement and sound interference
Data Source
AI summary
In one embodiment, an exhaust device has an inner cone stack assembly made up of connectedly overlapping inner cone components with frustums. The inner cone stack assembly is disposed within an outer shell and connected to the exhaust device using contoured flanges to match the contours of mounting surfaces on the exhaust device. An outer cone stack assembly made up of baffle ring retainers having a number of detents and baffle frustums with ears inserted in the detents. The outer cone stack assembly is also disposed within the outer shell. The cone frustums of the inner cone stack assembly and the baffle frustums of the outer cone stack assembly cooperate to break down particles and attenuate sound.