Exhaust Pipe Surface Coat Layer for Heat Dissipation
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Solution Overview
Problem
Existing exhaust pipes with complex structures, such as those with double-pipe configurations and movable heat transfer members, face challenges in efficiently managing high exhaust gas temperatures during high-speed engine operations, leading to potential catalyst deterioration and inefficient heat dissipation.
Innovation Solution
A simplified exhaust pipe design featuring a surface coat layer composed of inorganic glass and high-emissivity particles, applied using a paint that includes an inorganic binder or binder precursor, which forms a durable and efficient heat dissipation layer without the need for additional parts or heating treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a double-pipe structure with movable heat transfer member is used, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The patent merges the heat dissipation function into a single-pipe structure by forming a surface coat layer directly on the exhaust pipe base, eliminating the need for separate inner pipes, outer pipes, and movable heat transfer members. The surface coat layer comprises inorganic glass particles and inorganic particles with high emissivity, creating an integrated solution that maintains exhaust gas temperature control while simplifying the overall structure.
Solution Approach 2:
The patent changes the surface properties of the exhaust pipe by applying a surface coat layer with specific material composition (inorganic glass particles and inorganic particles). This modifies the thermal radiation characteristics of the pipe surface, enhancing heat dissipation through radiative heat transfer without requiring complex mechanical structures. The inorganic particles provide high emissivity, fundamentally changing how the pipe interacts thermally with its environment.
2Temperature
If a surface coat layer with inorganic glass and inorganic particles is applied, then heat dissipation is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent applies the surface coat layer composition (exhaust pipe paint containing inorganic glass particles and inorganic particles) to the exhaust pipe base in advance, before the pipe is put into service. This preliminary coating action allows the heat dissipation functionality to be established during manufacturing, rather than requiring complex assembly or activation procedures later. The coating is applied as a paint formulation that can be straightforwardly coated onto the pipe surface.
Solution Approach 2:
The patent uses a composite material formulation for the exhaust pipe paint, combining inorganic glass particles (which soften at elevated temperatures to form a binding matrix) with inorganic particles having high emissivity. This composite structure provides both adhesion to the pipe surface and enhanced thermal radiation properties. The inorganic glass particles soften and integrate to form a glass substrate that binds the inorganic particles, creating a durable, functionally integrated coating.
3Reliability
If heating treatment at high temperature is performed, then surface coat layer formation is achieved, but energy consumption increases
Solution Approach 1:
The patent utilizes the exhaust gas itself, which naturally flows through the exhaust pipe during normal engine operation, as the heating medium to form and cure the surface coat layer. The exhaust gas temperature, which is already high enough to soften the inorganic glass particles, serves as the heat source for the coating process. This eliminates the need for separate external heating equipment or additional energy input, as the system uses its own operational byproduct (hot exhaust gas) to complete the coating formation.
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 surface coat layer effectively manages high exhaust gas temperatures, preventing catalyst deterioration and ensuring efficient heat dissipation, even during high-speed operations, while reducing environmental impact by eliminating the need for high-energy heating treatments.
Implementation Method 1
The heating treatment softens the inorganic glass particles, and the softened inorganic glass particles are integrated to form a glass substrate
Implementation Method 2
The surface coat layer includes an inorganic glass and inorganic particles having a high emissivity
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(d)
AI summary
It is an object of the present invention to provide an exhaust pipe paint with which it is possible to manufacture an exhaust pipe having predetermined heat dissipation by taking advantage of heat of exhaust gas without performing a heating treatment. An exhaust pipe paint of the present invention for application to an exhaust pipe base comprises: an inorganic glass particle; an inorganic particle; and at least one of an inorganic binder and an inorganic binder precursor.