Marine Propulsion Unit Drainage With an Intermediate Tank
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Solution Overview
Problem
Pneumatically operated drainage arrangements face limitations in maximum theoretical suction height capacity, leading to low suction capacity when draining liquids from the bottom sections of large marine propulsion units, where the shell structure height exceeds 8 meters, making it difficult to lift liquids into the hull of a marine vessel.
Innovation Solution
The implementation of an intermediate tank within the propulsion unit's shell structure allows for a two-step drainage process: first, liquid is sucked from the bottom section into the intermediate tank, maintaining low suction height and high suction capacity, and second, the liquid is pressed from the intermediate tank into a collector arrangement within the hull using a pneumatically operated pressurizing arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a pneumatically operated drainage arrangement is used to drain liquid from the bottom section of the propulsion unit, then the suction height capacity is limited to about 10.33 meters at sea level, but the suction capacity becomes very low when the suction height is around 7 meters or more
Solution Approach 1:
The drainage system is divided into two separate stages: first, a vacuum pump draws liquid from the bottom section into an intermediate tank located within the propulsion unit's shell structure; second, a pump transfers the liquid from the intermediate tank to the collector arrangement in the hull. This segmentation allows each pump to operate over a shorter vertical distance, maintaining high suction capacity while achieving the required total lift height.
Solution Approach 2:
An intermediate tank is introduced as a mediator between the bottom section and the collector arrangement. This intermediate tank receives liquid from the bottom section via vacuum suction and then transfers it to the final destination, effectively breaking the single long suction lift into two shorter stages and thereby maintaining high suction capacity throughout the drainage process.
2Length of stationary object
If the shell structure height exceeds 8 meters, then the suction height requirement increases, but the suction capacity of the vacuum pump decreases significantly
Solution Approach 1:
The overall drainage task is segmented into two independent pumping operations: the first vacuum pump handles the lift from the bottom section to the intermediate tank, and the second pump handles the transfer from the intermediate tank to the collector arrangement. This segmentation ensures that neither pump needs to overcome the full 8+ meter height difference, thereby maintaining high suction capacity for both operations.
Solution Approach 2:
The system introduces a spatial intermediate stage (the intermediate tank) at a mid-level position within the propulsion unit, transforming a single vertical lift challenge into two manageable vertical stages. This dimensional approach allows each pump to operate within its optimal suction height range while collectively achieving the required total lift.
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 solution enhances the drainage capacity by allowing efficient liquid transfer from the bottom sections of the propulsion unit to the hull, overcoming the limitations of traditional drainage systems by maintaining high suction capacity even at greater heights.
Implementation Method 1
The pressurizing arrangement (9) is configured to selectively provide a vacuum in the intermediate tank (8) or an excess pressure in the intermediate tank (8)
Implementation Method 2
The pressurizing arrangement (9) is configured to selectively provide a vacuum in the intermediate tank (8) or an excess pressure in the intermediate tank (8)
Data Source
Figure 1
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AI summary
Presented is a draining arrangement of a propulsion unit (1) of a marine vessel (2). The propulsion unit (1) comprises a shell structure (3). The shell structure (3) limiting at least one bottom section (5) configured to receive liquids. The draining arrangement comprising a pneumatically operated drainage arrangement comprising an intermediate tank (8) within the shell structure (3), a pressurizing arrangement (9) functionally connected to the intermediate tank (8) and configured to selectively provide a vacuum in the intermediate tank (8) or an excess pressure in the intermediate tank (8), a first liquid line (10) that is provided between the intermediate tank (8) and said at least one bottom section (5), and a second liquid line (12) that is provided between the intermediate tank (8) and a collector arrangement (7) within the hull (4) of the marine vessel (2),