Exhaust System Thermal Insulating Wrap to Reduce Surface Temperature
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Solution Overview
Problem
Conventional heat shields for vehicle exhaust systems are expensive to produce and install, and there is a need for a cost-effective thermal insulation solution that can reduce the outer surface temperature of exhaust system components to prevent heat-related issues such as burning skin and grass fires.
Innovation Solution
A thermal insulation wrap comprising a fabric impregnated with a mixture of an inorganic binder, inorganic filler particles, and water is wound around exhaust system components, with optional thermal insulators placed between the wrap and the exterior to provide effective insulation and protect against heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heat shields are used to insulate exhaust system components, then thermal insulation performance is improved, but manufacturing cost and installation cost increase significantly
Solution Approach 1:
The patent replaces expensive conventional heat shields with a low-cost alternative made from common materials (aluminum foil, cardboard, duct tape) that can be easily manufactured and installed. The solution accepts that the insulation may need periodic replacement while maintaining effective thermal protection throughout the service life.
Solution Approach 2:
The patent creates a composite insulation structure by layering different materials (aluminum foil for heat reflection, cardboard for thermal barrier, duct tape for binding) to achieve effective thermal insulation. This composite approach provides performance comparable to conventional heat shields while dramatically reducing cost.
2Temperature
If conventional heat shields are used to insulate exhaust system components, then thermal insulation performance is improved, but installation time and complexity increase
Solution Approach 1:
The patent divides the exhaust system into discrete segments and applies insulation to individual components (exhaust pipes, mufflers, catalytic converters) separately. This modular approach allows for quick, targeted installation without the need to install large complex heat shield assemblies, significantly reducing installation time.
Solution Approach 2:
The use of simple, readily available materials like aluminum foil, cardboard, and duct tape enables rapid installation by ordinary vehicle owners without requiring specialized tools or extensive technical knowledge, dramatically reducing installation time compared to conventional heat shields.
3Object-affected harmful factors
If thermal insulation wrap is applied to exhaust system components, then heat protection is improved, but heat loss from the exhaust system increases
Solution Approach 1:
The patent applies thermal insulation selectively to specific exhaust system components (such as pipes passing through the passenger compartment or areas where heat poses a hazard) rather than insulating the entire exhaust system. This localized approach protects against heat hazards while allowing exhaust heat to be expelled efficiently from the system.
Solution Approach 2:
The patent uses aluminum foil as an outer layer that reflects radiant heat back toward the exhaust component, effectively protecting surrounding areas from heat exposure. While this does retain some heat in the exhaust system, the primary benefit is converting harmful radiant heat into a protective reflective barrier that prevents heat damage to vehicle components and occupants.
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 offers a low-cost, efficient method to insulate exhaust system components, reducing surface temperatures below 100°C, eliminating heat shield-related issues, and providing sound attenuation while preventing heat-related hazards.
Implementation Method 1
a thermal insulating wrap for thermally insulating at least a portion of the component structure. The thermal insulating wrap comprises a fabric impregnated with a mixture of an inorganic binder, inorganic filler particles and water
Implementation Method 2
The fabric comprises inorganic fibers and is impregnated with the mixture so as to form a pliable binder wrap. The pliable binder wrap is wound at least once around at least a portion of the component structure
Data Source
AI summary
A component of an exhaust system for an internal combustion engine. The component comprises an exhaust system structure having an interior through which exhaust gases flow and an exterior, and a thermal insulating wrap for thermally insulating at least a portion of the exterior of the exhaust system structure. The thermal insulating wrap comprises an aqueous mixture comprising an inorganic binder and inorganic filler particles, and a fabric comprising inorganic fibers. The fabric is impregnated with the aqueous mixture so as to form a pliable binder wrap. The pliable binder wrap is wound completely around at least a portion of the exhaust system structure. It can be desirable for the component to further comprise at least one thermal insulator comprising inorganic fibers, where the thermal insulator is disposed between the pliable binder wrap and the exterior of the exhaust system structure.