Exhaust Cooling Device With Necked-Down Section And Openings
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Solution Overview
Problem
Conventional exhaust systems, particularly for diesel particulate filter applications, experience high exhaust gas temperatures that can exceed 650°C, posing a risk of igniting flammable materials and necessitating a solution to reduce exhaust temperatures and eliminate hot spots.
Innovation Solution
An exhaust cooling device with a tubular housing featuring a necked-down section and frusto-conical nozzle element, along with circumferentially spaced openings to allow ambient air flow for cooling, and an optional debris shield to prevent debris entry, effectively directing exhaust gas flow and mixing it with cooler ambient air for temperature reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional exhaust systems are used for diesel particulate filter applications, then exhaust gas temperatures can exceed 650°C, but this poses a risk of igniting flammable materials
Solution Approach 1:
The patent introduces ambient air as an intermediary cooling medium that mixes with the hot exhaust gas in the tubular housing. The frusto-conical nozzle directs exhaust flow while the openings allow ambient air to enter, creating a mixed flow that reduces temperature before exit, thereby eliminating the ignition risk without directly modifying the exhaust gas composition
Solution Approach 2:
The patent extracts heat from the exhaust gas system by introducing external ambient air through the openings in the necked-down section. This extracted heat is dissipated to the surrounding environment, allowing the exhaust temperature to be reduced to safe levels below the ignition point of flammable materials
2Object-affected harmful factors
If a cooling device is added to reduce exhaust temperature, then ignition risk is reduced, but device complexity increases
Solution Approach 1:
The tubular housing serves multiple functions: it acts as a mixing chamber for ambient air and exhaust gas, provides structural support for the frusto-conical nozzle, and facilitates heat dissipation to the surrounding environment. This multi-functionality reduces the need for additional separate cooling components, thereby limiting the increase in device complexity
Solution Approach 2:
The frusto-conical nozzle is nested within the tubular housing structure, with the nozzle element positioned concentrically inside the housing. The openings are integrated into the necked-down section of the housing itself. This nested arrangement consolidates multiple components into a compact integrated assembly, minimizing the increase in overall device complexity
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 solution effectively reduces exhaust temperatures by increasing exhaust flow velocity through the nozzle, creating a suction effect that draws in ambient air for mixing and cooling, thereby mitigating the risk of ignition and maintaining a standard exhaust pipe appearance.
Implementation Method 1
The venturi forming element or nozzle 22 creates a suction effect which draws the cooling air flow into the housing/pipe 20 for mixing and cooling the exhaust flow
Implementation Method 2
The cooling device includes a tubular housing having an upstream portion and a downstream portion, with the upstream portion having a necked-down section tapered in an upstream direction, and a plurality of openings formed in the necked down section to allow an ambient air flow from an exterior of the tubular housing to an interior of the tubular housing
Data Source
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Figure 6
AI summary
An exhaust cooling device (10) is provided for an exhaust pipe (12) of a combustion process. The cooling device (10) includes a tubular housing (20) having an upstream portion (16) and a downstream portion (18), with the upstream portion (16) having a necked-down section (24) tapered in an upstream direction, and a plurality of openings (30) formed in the necked-down section (24) to allow an ambient air flow from an exterior of the tubular housing (20) to an interior of the tubular housing (20). The cooling device (10) further includes a nozzle element (22) fixed in the necked-down section (24) to direct an exhaust gas flow into the tubular housing (20).