Exhaust Heating Device Labyrinth Insulation
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Solution Overview
Problem
Existing heating devices for exhaust systems of internal combustion engines face inefficiencies due to heat loss from the combustion chamber, leading to overheating of components and reduced energy efficiency, as they struggle to quickly reach the high operating temperature required for catalysts during cold starts, resulting in high polluting emissions.
Innovation Solution
A heating device with a tubular body and labyrinthine structure that provides thermal insulation and pre-heats combustion air, optimizing air-fuel mixing and using a static mixer to enhance turbulence, while controlling the temperature of combustion gases through calibrated exchange holes to efficiently heat the catalyst without overheating nearby components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If thermal insulation is applied to the combustion chamber walls to limit heat dispersion, then heat loss is reduced and energy efficiency is improved, but the production cost and device size significantly increase
Solution Approach 1:
The combustion chamber walls serve dual functions: they contain the combustion process and simultaneously preheat the incoming air through controlled heat transfer. The walls act as a heat exchanger, absorbing heat from combustion gases and transferring it to the air stream, thereby reducing overall heat loss without requiring external insulation layers
Solution Approach 2:
The patent modifies the thermal properties of the combustion chamber system by changing the temperature parameters of different zones. The walls maintain different temperatures on their inner and outer surfaces, creating a controlled thermal gradient that optimizes heat transfer to the air while limiting heat loss to the surroundings, eliminating the need for additional insulation
2Ease of manufacture
If the combustion chamber walls are allowed to release heat to surrounding components, then manufacturing simplicity is maintained, but nearby components overheat and energy efficiency decreases
Solution Approach 1:
The incoming air stream acts as an intermediary heat transfer medium. It absorbs excess heat from the combustion chamber walls in a controlled manner, preventing direct heat transfer to surrounding components. This intermediary layer protects nearby parts from overheating while utilizing the thermal energy that would otherwise be wasted
Solution Approach 2:
The patent converts the potentially harmful effect of heat release from the combustion chamber walls into a beneficial preheating process. The heat that would otherwise overheat surrounding components is instead used to preheat the incoming air, improving combustion efficiency and reducing the need for external heating systems
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 achieves high energy efficiency, reduces component overheating, and maintains thermal power while being compact and inexpensive to manufacture, ensuring effective catalyst heating and reduced emissions during cold starts.
Implementation Method 1
by burning fuel, generates a flow of (very) hot air passing through the catalyst
Implementation Method 2
generates a flow of air that passes through the combustion chamber
Implementation Method 3
A heating device with a tubular body and labyrinthine structure that provides thermal insulation
Implementation Method 4
using a static mixer to enhance turbulence
Implementation Method 5
controlling the temperature of combustion gases through calibrated exchange holes to efficiently heat the catalyst
Data Source
Figure 1
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AI summary
A heating device (6) for an exhaust system (1) of an internal combustion engine (2); the heating device (6) has: a first tubular body (12) wherein a combustion chamber (7) is obtained; a fuel injector (9) to inject fuel into the combustion chamber (7); an inlet opening (18), which is obtained through the first tubular body (12) and can be connected to a fan (8) to receive an air flow, which is directed into the combustion chamber (7); a hot air outlet opening (17) to let hot air out of the combustion chamber (7); an outlet duct (11), which originates from the outlet opening (17); a spark plug (10) which is mounted through a side wall (16) of the first tubular body (12) to trigger the combustion of a mixture of air and fuel; and a labyrinth (26), which surrounds a side wall (16) of the tubular body (12), starts from the inlet opening (18), ends in the combustion chamber (7), and the air must necessarily flow out of the inlet opening (18) until reaching the combustion chamber (7) .