Serviceable Cooling Water Strainer for Marine Exhaust
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Solution Overview
Problem
Existing marine propulsion cooling systems face challenges in reliably and uniformly cooling hot exhaust gases from internal combustion engines, particularly due to blockages and failures in cooling water sprayers that can lead to excessively high exhaust gas temperatures and potential engine damage.
Innovation Solution
A marine propulsion device with a manually serviceable cooling water strainer and redundant cooling water sprayers that spray cooling water into the exhaust manifold, featuring a plug with holes to separate solids and ensure a water-tight seal, allowing for easy maintenance without tools, and independent water sources for each sprayer to prevent contamination and clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cooling water strainer is installed in the cooling water passage, then solids are strained from cooling water preventing blockages, but the strainer may become clogged requiring maintenance
Solution Approach 1:
The strainer is segmented into a removable plug component that can be separated from the exhaust manifold. The plug contains the filtering surface and can be independently removed for cleaning or replacement, allowing maintenance without disassembling the entire exhaust manifold or cooling system.
Solution Approach 2:
A boss structure acts as an intermediary between the exhaust manifold and the removable plug. The boss provides a mounting interface that allows the plug to be easily attached and detached, facilitating maintenance while maintaining a sealed connection during operation.
2Reliability
If multiple cooling water sprayers are used to cool exhaust gases uniformly, then cooling reliability is improved, but the system complexity increases
Solution Approach 1:
The cooling system is segmented into multiple independent sprayer units distributed at different locations within the exhaust manifold. Each sprayer receives cooling water from independent passages, allowing uniform cooling coverage while maintaining modular simplicity in the overall system design.
Solution Approach 2:
Different regions of the exhaust manifold are targeted by specific sprayers located at optimal positions. This local quality approach ensures that each area of the exhaust manifold receives adequate cooling attention, improving overall cooling reliability without requiring a uniformly complex system throughout.
3Temperature
If cooling water is sprayed directly into the exhaust manifold, then exhaust gas cooling effectiveness is improved, but the risk of contamination and clogging from solids increases
Solution Approach 1:
The cooling water is pre-filtered by the strainer plug before being distributed to the sprayers and injected into the exhaust manifold. This preliminary filtering action removes solids that could cause clogging or contamination, while still allowing the cooling water to effectively lower exhaust gas temperatures.
Solution Approach 2:
The strainer plug acts as an intermediary between the cooling water source and the exhaust manifold. It filters out harmful solids while allowing the beneficial cooling function to proceed, protecting the sprayers and exhaust system from contamination.
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 effectively strains solids from the cooling water, preventing blockages and ensuring reliable, uniform cooling of exhaust gases, thereby protecting the engine from damage and maintaining optimal operating temperatures.
Implementation Method 1
a cooling water sprayer that sprays cooling water into the exhaust manifold
Implementation Method 2
a cooling water jacket on the exhaust manifold, wherein a cooling water passage for conveying cooling water alongside the exhaust manifold is defined between the cooling water jacket and exhaust manifold
Data Source
AI summary
A marine propulsion device has an engine; an exhaust manifold for conveying exhaust gas from the engine; a cooling water jacket on the exhaust manifold, wherein a cooling water passage for conveying cooling water alongside the exhaust manifold is defined between the cooling water jacket and exhaust manifold; and a cooling water sprayer that sprays cooling water into the exhaust manifold. A manually serviceable cooling water strainer configured to strain cooling water supplied from the cooling water passage to the cooling water sprayer. The manually serviceable cooling water strainer can be manually coupled to and manually uncoupled from the marine propulsion device without use of a tool.