Buoyancy-Driven Seabed Ore Lifting Without Surface Tethers
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Solution Overview
Problem
Current methods for collecting seabed mineral resources, such as cobalt-rich crusts and rare earth deposits, are not economically feasible beyond depths of 1000 m due to mechanical and structural challenges in high-pressure environments, and existing technologies require energy input, pressure-resistant equipment, and mechanical connections between the sea surface and seabed, limiting efficiency and scalability.
Innovation Solution
A buoyancy-based system using a liquid with a lower specific gravity than water, such as n-pentane or gasoline, is used to collect seabed mineral ores by exchanging ballast with the collected ores at the seabed, eliminating the need for pressure-resistant equipment and mechanical connections, and allowing autonomous navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional pressure-resistant equipment and mechanical connection systems are used to collect seabed mineral resources, then collection capability is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The invention extracts and removes the complex mechanical connection structure from the system. Instead of using traditional pressure-resistant equipment and mechanical connections between surface and seabed, the patent employs a free-floating collection device that operates autonomously at the seabed, eliminating the need for complex surface-seabed mechanical linkages while maintaining collection capability
Solution Approach 2:
The invention replaces the mechanical connection system with a buoyancy-based lifting mechanism. The collection device uses buoyant force to rise to the surface with collected minerals, substituting mechanical hauling systems with a passive buoyancy-driven approach that reduces device complexity
2Productivity
If energy input is provided to collect and lift seabed mineral resources, then collection efficiency improves, but energy consumption and operational cost increase
Solution Approach 1:
The collection device is designed to be self-propelled and self-lifting. It uses its own onboard propulsion system to navigate to the seabed and collect minerals, then utilizes its built-in buoyancy mechanism to automatically rise to the surface without external energy input, making the system self-sufficient and eliminating continuous energy supply requirements
Solution Approach 2:
The system operates in periodic cycles: descent to seabed, collection phase, ascent to surface using buoyancy, and surface discharge. This periodic operation allows the device to accumulate collected minerals during descent and collection, then release them in bulk at the surface, improving overall collection efficiency while reducing continuous energy consumption
3Productivity
If mechanical connection structures are used between sea surface and seabed, then resource collection is enabled, but maintenance and inspection difficulty increases
Solution Approach 1:
The system is divided into independent segments: the surface support vessel and the autonomous seabed collection device. The collection device operates independently at the seabed and returns to the surface for discharge and replenishment of collection bags. This segmentation allows the collection device to be maintained and inspected at the surface where access is easy, rather than requiring underwater maintenance of complex mechanical connections
4Adaptability or versatility
If autonomous underwater navigation is implemented, then operational flexibility improves, but navigation control complexity increases
Solution Approach 1:
The navigation and control systems are standardized and modularized, using commercially available autonomous underwater vehicle components. By copying proven navigation solutions from existing AUV technology, the patent achieves operational flexibility without developing complex custom navigation systems, reducing overall device complexity while maintaining adaptability
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 method enables efficient, cost-effective collection of seabed mineral ores without energy input, reduces mechanical stress, and facilitates scalability and maneuverability, avoiding energy waste and seawater pollution, while maintaining ease of maintenance and inspection.
Implementation Method 1
by using the buoyancy of a liquid having a lower specific gravity than water without inputting energy for collection
Data Source
AI summary
The present invention relates to a system and its equipments to collect mineral ores on the seabed and to float them up to the sea surface by utilizing the buoyancy of a liquid having a specific gravity less than that of water at room temperature. It is an underwater navigator capable of autonomous navigation that descends at a specific gravity of around 1.0 with a ballast that cancels buoyancy when descending from the sea surface, and ascends at a specific gravity of around 1.0 by exchanging mineral ores with the ballast on the seabed. On the seafloor, it is accompanied by a device that collects seabed mineral ores for the underwater vehicle.