Closed-Pore Heat Shielding Membrane for Combustion Gas Blocking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional heat shielding membranes with low thermal conductivity and heat capacity fail to provide sufficient heat-insulation performance due to open pores that allow combustion gas to enter and dissipate heat, leading to increased cooling loss and decreased fuel economy in internal combustion engines.
Innovation Solution
A heat shielding membrane with a porous layer and a dense layer, incorporating a resin and carbon-based filler, where the porous layer features closed pores and a thermal decomposition temperature of 350°C or more, preventing heat accumulation and improving thermal conductivity while maintaining low heat capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a porous heat shielding membrane is used to reduce thermal conductivity and heat capacity, then heat insulation performance is improved, but combustion gas enters the pores and dissipates heat, reducing effective heat insulation
Solution Approach 1:
The patent employs a porous coating layer with controlled pore structure to reduce thermal conductivity while maintaining heat insulation performance. The porous structure reduces heat capacity and thermal conductivity, but when combined with a dense layer to prevent gas penetration, it achieves both low thermal conductivity and effective heat insulation by blocking combustion gas from entering pores.
Solution Approach 2:
The patent uses a composite structure consisting of a porous layer and a dense layer. The porous layer reduces thermal conductivity and heat capacity, while the dense layer prevents combustion gas penetration. This composite approach resolves the contradiction by combining the advantages of both porous and dense structures.
2Reliability
If the wall surface temperature follows gas temperature change, then heat insulation performance is optimized, but this requires precise control of thermal properties that is difficult to achieve
Solution Approach 1:
The patent achieves temperature-following behavior by carefully selecting and combining materials with specific thermal properties. The porous layer provides low thermal conductivity while the dense layer prevents gas penetration, creating a composite structure that naturally adapts to gas temperature changes without requiring complex control 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 membrane effectively reduces cooling loss and enhances fuel economy by maintaining low thermal conductivity and heat capacity, ensuring the heat shielding membrane follows the temperature of the combustion chamber gas, thereby improving heat-insulation performance.
Implementation Method 1
a porous layer including at least a closed pore... low thermal conductivity
Implementation Method 2
low heat capacity... preventing heat accumulation
Data Source
Figure 1
AI summary
A heat shielding member includes a base, and a heat shielding membrane on the base. The heat shielding membrane includes a porous layer including at least a closed pore. The porous layer includes resin and carbon-based filler. The heat shielding member has both of low thermal conductivity and low heat capacity and improves the fuel economy performance.