Additive Water-Cooled Exhaust Components Without Weld Failures
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Solution Overview
Problem
Current water-cooled exhaust systems for marine applications face durability and reliability issues due to the limitations of cast and weldment manufacturing methods, particularly in high-performance applications where welds are prone to failure.
Innovation Solution
The use of additive manufacturing to create a single, integral water-cooled exhaust component with a conduit, water jacket, and internal structures, including ribs and channels, that provide support and fluid flow while minimizing hot spots and promoting heat absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cast manufacturing is used for water-cooled exhaust components, then durability is improved, but performance is limited and complexity of internal structures cannot be achieved
Solution Approach 1:
The patent changes the manufacturing method from traditional casting to additive manufacturing, enabling complex internal water channels and structures that were previously impossible to achieve. This allows optimization of heat transfer parameters while maintaining the durability benefits of cast components.
Solution Approach 2:
The patent employs stainless steel materials with specific compositional parameters optimized for both durability and heat transfer performance, combining the benefits of cast durability with enhanced performance capabilities through material science advancements.
2Adaptability or versatility
If weldment/fabrication is used for water-cooled exhaust components, then high performance is achieved, but durability deteriorates due to weld failures
Solution Approach 1:
The patent merges the water jacket and exhaust conduit into a single integral component manufactured via additive manufacturing, eliminating the welds between separate parts. This combines the performance benefits of fabricated components with the durability of integrated construction, removing the weak point of weld failures.
Solution Approach 2:
The patent replaces the mechanical joining method (welding) with an additive manufacturing process that creates integral structures, substituting a reliable monolithic construction for a less reliable assembled construction with potential weld failure points.
3Use of energy by stationary object
If traditional water jackets are used, then cooling function is provided, but hot spots occur and heat transfer efficiency is insufficient
Solution Approach 1:
The patent segments the water jacket into multiple narrow channels instead of a single large cavity, increasing the surface area for heat transfer and eliminating hot spots by distributing coolant flow more uniformly across the exhaust conduit surface.
Solution Approach 2:
The patent adds internal structural dimensions (ribs, stringers, and multi-channel configurations) to the traditional water jacket design, creating a three-dimensional heat transfer network that significantly increases effective heat exchange surface area and efficiency.
4Adaptability or versatility
If additive manufacturing is used for water-cooled exhaust components, then durability and performance are improved, but manufacturing complexity increases
Solution Approach 1:
The additive manufacturing process creates self-supporting internal structures (ribs and stringers) that are integral to the component, eliminating the need for separate manufacturing steps, assembly operations, and post-processing that would increase manufacturing complexity in traditional methods.
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
This approach results in a more durable and reliable high-performance water-cooled exhaust system with improved heat transfer efficiency and reduced risk of engine damage from water intrusion, enhancing both durability and engine efficiency.
Implementation Method 1
supplying fluid to the fluid inlet such that it flows into the water cavity... as the fluid flows through the water cavity, the fluid absorbs heat from hot exhaust gases flowing through the conduit
Implementation Method 2
The internal structures include a plurality of ribs or stringers defining a plurality of channels within the water cavity... promote the distribution of the fluid in the water jacket
Data Source
AI summary
An exhaust component for an engine exhaust system includes a conduit for carrying exhaust gases, an outer wall, a fluid inlet, a fluid outlet, and a pattern of internal support structures. The conduit, outer wall, and internal support structures are formed from an additive material using an additive manufacturing process. A water cavity is defined between the conduit and the outer wall. The fluid inlet and outlet are in fluid communication with the water cavity. The pattern of internal support structures are integral with the conduit and with the outer wall, are disposed in the water cavity, and are arranged such that fluid flows from the fluid inlet through, between, or around the internal support structures to the fluid outlet. The fluid and its flow through the water cavity is adapted to absorb heat from hot exhaust gases flowing through the conduit during operation of the engine exhaust system.