Marine Engine Cooling System Lower End Drain Port
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Solution Overview
Problem
In small marine vessels, cooling water can become stagnant in flow passage portions of the cylinder block when the engine is stopped, leading to potential rusting or freezing issues in cold environments.
Innovation Solution
The implementation of a marine vessel and engine cooling system design that includes a thermostat to adjust the flow rate of cooling water based on temperature, and a lower end flow passage port in the cylinder block to allow water to drain when the engine is stopped, thereby preventing stagnation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine is stopped, then the cooling water flow stops, but the cooling water becomes stagnant in the flow passage portion of the cylinder block
Solution Approach 1:
The patent applies the inversion principle by introducing a lower end flow passage port that allows cooling water to drain downward from the cylinder block when the engine is stopped. This reverse drainage path prevents stagnation by enabling gravity-assisted water removal from the lowest point of the flow passage, directly addressing the stagnation problem without requiring continuous engine operation.
2Temperature
If cooling water flows through the cylinder block, then the engine is cooled, but the cooling water temperature may become too low causing excessive cooling
Solution Approach 1:
The patent applies feedback control through the thermostat, which monitors the temperature of cooling water discharged from the cylinder block and automatically adjusts the flow rate accordingly. When the cooling water temperature becomes too low, the thermostat reduces the flow rate to prevent excessive cooling; when the temperature is appropriate, it maintains or increases the flow rate to ensure effective engine cooling.
3Reliability
If a dedicated drainage flow passage is added to prevent stagnation, then water can drain when the engine is stopped, but the device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the lower end flow passage port to serve dual purposes: it acts as both a cooling water inlet during engine operation and a drainage outlet when the engine is stopped. This single structure performs multiple functions, preventing stagnation without requiring a completely separate dedicated drainage system, thus limiting the increase in device complexity.
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 design effectively reduces or prevents stagnation of cooling water in the cylinder block, preventing rust and freezing issues, while also ensuring appropriate cooling of the engine components.
Implementation Method 1
a thermostat in a vicinity of or adjacent to a cooling water outlet of the cylinder block to adjust a flow rate of the cooling water discharged from the cylinder block based on a temperature of the cooling water
Implementation Method 2
a cooling flow passage to allow cooling water to flow therethrough to cool the engine
Implementation Method 3
allow the cooling water that has flowed through the exhaust manifold to flow into the cylinder block via the cylinder head
Implementation Method 4
the flow passage connected to the cylinder block via the lower end flow passage port extends downward, and thus water is drained from the flow passage portion in the cylinder block via the lower end flow passage port when the engine is stopped
Data Source
AI summary
A marine vessel includes a cooling flow passage to allow cooling water to flow into a cylinder block from a lower side of the cylinder block via a lower end flow passage port in a vicinity of or adjacent to a lower end of a flow passage portion in the cylinder block.