Heat Releasing Pipe With Electrocoated Glass Coating
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Solution Overview
Problem
Existing exhaust pipes face challenges in efficiently releasing heat during high-speed engine operations, leading to potential catalyst deterioration and reduced exhaust gas purification efficiency due to temperature limitations of catalyst converters.
Innovation Solution
A heat releasing pipe with a metal base material coated with an inorganic glass base material containing concave and convex portions on its surface, enhancing emissivity and thermal stress relief through electrocoating, which increases the surface area for radiant heat transfer and prevents separation of the surface coating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a smooth surface coating layer is applied on the metal pipe, then the coating layer maintains good adhesion and uniform appearance, but the heat releasing efficiency and emissivity are insufficient
Solution Approach 1:
The surface coating layer is designed with concave and convex portions creating a three-dimensional curved surface topology. This curvature increases the surface area and enhances emissivity by providing multiple angles for radiant heat transfer, while the convex portions act as stress distribution points that prevent coating separation during thermal cycling.
2Loss of energy
If the surface coating layer is made thick to improve heat radiation, then the heat releasing capability increases, but the coating layer may separate from the metal pipe due to thermal stress
Solution Approach 1:
The coating layer incorporates localized convex portions that create regions of varying thickness and mechanical properties. These convex portions act as stress relief points that locally accommodate thermal expansion differences between the metal pipe and coating material, preventing uniform stress distribution that would cause separation. The concave portions between convex features provide additional surface area for heat radiation without requiring uniform thickness throughout.
3Loss of energy
If a simple single-layer coating is applied, then the manufacturing process is simple and cost-effective, but the heat releasing performance and surface durability are limited
Solution Approach 1:
The surface coating layer incorporates a controlled porous structure with concave portions that increase the effective surface area for heat radiation. This porous topology enhances emissivity by providing multiple internal surfaces for thermal radiation while maintaining a relatively simple single-layer construction. The porous structure also provides thermal mass that helps stabilize temperature fluctuations without requiring complex multi-layer designs.
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 enhanced heat releasing pipe achieves superior heat transfer characteristics, maintains high emissivity, and prevents separation of the surface coating layer, ensuring effective heat dissipation and prolonged durability.
Implementation Method 1
an exhaust pipe having a structure in which a layer composed of a crystalline inorganic material and an amorphous inorganic material has infrared-ray emissivity higher than that of the base material so as to provide the exhaust pipe with an excellent heat releasing characteristic
Implementation Method 2
The concave portions and the convex portions are constructed using electrocoating with an electrocoating resin
Data Source
AI summary
A heat releasing pipe includes a metal pipe and a surface coating layer. The metal pipe has an outer circumferential surface. The surface coating layer is provided on the outer circumferential surface of the metal pipe. The surface coating layer contains an inorganic glass base material and has concave portions and convex portions on an outer surface of the surface coating layer. The concave portions and the convex portions are constructed using electrocoating with an electrocoating resin. The concave portions have a virtually circular shape when seen in a direction perpendicular to the outer circumferential surface of the metal pipe and are lower than a first reference surface. The first reference surface has an average height of the outer surface of the surface coating layer. The convex portions are located on peripheral edge portions of the concave portions and surround the concave portions.