Ship Propulsion Cooling Device With Flexible Filter Access
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Solution Overview
Problem
Existing cooling devices for ship propulsion machines face challenges in maintaining a filter device that collects fine objects while preventing pressure loss and facilitating easy maintenance due to the difficulty in removing the filter device from between rigid drain passage portions.
Innovation Solution
A cooling device design with a flexible lower connection pipe featuring first and second bent portions allows for easy removal of the filter device by bending, thereby maintaining flow efficiency and facilitating maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter device is disposed between the upper drain passage portion and the lower drain passage portion coaxially, then the cooling water flows linearly and pressure loss is prevented, but the filter device becomes difficult to remove for maintenance
Solution Approach 1:
The drain passage is divided into an upper drain passage portion and a lower drain passage portion that are separable from each other. The filter device is disposed between these two portions, allowing the upper and lower portions to be separated for maintenance access while maintaining linear flow when assembled
Solution Approach 2:
The upper drain passage portion is configured to be displaceable in the radial direction relative to the lower drain passage portion. This radial displacement capability provides an additional degree of freedom for maintenance operations without compromising the linear axial flow path during normal operation
2Ease of operation
If the cooling water flows while being largely bent in the filter device, then the filter device can be easily removed, but the pressure loss in the flow path increases and cooling water flow deteriorates
Solution Approach 1:
By segmenting the drain passage into separable upper and lower portions with the filter device positioned between them, the system maintains linear flow through the filter during operation while enabling easy removal by separating the segments rather than navigating bent paths
Solution Approach 2:
The radial displacement capability of the upper drain passage portion provides an alternative dimension for filter device access and removal, avoiding the need for the cooling water to flow through bent paths while still enabling easy maintenance operations
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 design prevents pressure loss in the cooling water flow and enables easy maintenance of the filter device by allowing for simple separation of components, enhancing the overall performance and durability of the cooling system.
Implementation Method 1
a lower connection pipe (54) having flexibility, whose upper end portion is connected to a lower portion of the case (41), whose lower end portion is connected to the downstream portion (27B) of the drain passage (27)
Implementation Method 2
supplies the taken water as cooling water to a water jacket provided in an engine of the outboard motor. The cooling water supplied to the water jacket flows through the water jacket, thereby cooling the engine
Implementation Method 3
the cooling water after flowing through the water jacket flows through a drain pipe, passes through the inside of a filter device provided in the middle of the drain pipe, and is then discharged to the outside of the outboard motor. When the cooling water passes through the filter device, the fine objects in the cooling water are captured by the filter device and removed from the cooling water
Data Source
AI summary
A cooling device for a ship propulsion machine includes a drain passage and a collector. The collector includes a collector main body, a case, an upper connection pipe, and a lower connection pipe having flexibility. A first bent portion is provided between an upper end portion and a lower end portion of the lower connection pipe. A second bent portion is provided between the first bent portion and the lower end portion of the lower connection pipe. The lower connection pipe extends downward from the upper end portion thereof along an axis of the case, bends at the first bent portion, extends downward while being inclined with respect to the axis so as to be separated from the axis, bends at the second bent portion, and extends downward while being inclined with respect to the axis so as to be close to the axis.