Closed-Pore Heat Shielding Membrane for Engine Cooling Loss
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Solution Overview
Problem
Conventional heat shielding membranes with low thermal conductivity and heat capacity fail to provide sufficient insulation 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 optional dense and heat-resistant layers, composed of resin and carbon-based fillers like graphene or graphite, which forms closed pores and improves thermal conductivity while maintaining low heat capacity, preventing heat accumulation and enhancing temperature following performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
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 serves as heat dissipation paths, reducing insulation effectiveness
Solution Approach 1:
The patent uses porous materials (resin with thermal decomposition temperature ≥350°C) to create closed pores that reduce heat capacity and thermal conductivity while maintaining structural integrity. The porous structure allows the membrane to achieve low thermal conductivity (0.05-0.20 W/m·K) and low heat capacity, preventing heat accumulation on the combustion chamber wall surface.
Solution Approach 2:
The patent employs a multi-layer structure where a porous layer is nested between dense layers. The dense layers (with thickness ratio of 20-80% of total membrane thickness) seal the porous layer, creating a nested configuration that prevents combustion gas penetration while maintaining the thermal insulation benefits of the porous intermediate layer.
2Temperature
If intake gas is heated by the combustion chamber wall surface, then expansion occurs, but intake efficiency decreases
Solution Approach 1:
The heat shielding membrane acts in advance to prevent excessive heat transfer from the combustion chamber wall to the intake gas. By maintaining the wall surface temperature within an optimal range (not too high), the membrane prevents the harmful effect of excessive heating that would cause intake gas expansion and reduce intake efficiency, while still allowing sufficient heating for proper combustion.
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 achieves both low thermal conductivity and heat capacity, reducing cooling loss and improving fuel economy by effectively insulating and maintaining temperature consistency with combustion gases.
Implementation Method 1
a porous layer including at least a closed pore and a dense layer from a side of the base, the porous layer and the dense layer include resin and carbon-based filler
Implementation Method 2
an thermal decomposition temperature of the resin is 350° C. or more
Implementation Method 3
the porous layer and the dense layer include resin and carbon-based filler
Data Source
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.