Diffuser Assembly Buoyancy Vessel Maintenance Retrieval
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Solution Overview
Problem
Maintenance and repair of individual diffuser modules in a grid pattern within large wastewater treatment basins are challenging due to inaccessibility and the need for mechanical retrieval, which is costly and cumbersome, especially when modules are located centrally or on the far side of the basin, making it difficult to lift and reposition them without tipping or rolling.
Innovation Solution
A diffuser assembly with a buoyancy vessel that provides buoyancy to raise the module to the surface for maintenance and inspection, using air to displace liquid and create buoyancy, and ballast to lower it back into position, ensuring stable orientation and preventing mechanical seal issues with self-sealing flow control sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical cranes are used to retrieve diffuser modules from the basin, then modules can be lifted and removed for maintenance, but the process becomes costly and cumbersome, especially for modules located centrally or on the far side of the basin
Solution Approach 1:
The patent applies the anti-weight principle by using a buoyancy vessel that provides upward buoyant force to counteract the weight of the diffuser module. This allows the module to be lifted from the basin bottom using pneumatic buoyancy rather than mechanical cranes, eliminating the need for expensive heavy-lift equipment and making modules accessible regardless of their location in the basin.
Solution Approach 2:
The patent uses pneumatics and hydraulics by employing a buoyancy vessel that can be filled with air or liquid to control the module's buoyancy. Air is pumped into the vessel to provide upward force for lifting, and liquid can be introduced to provide ballast for controlled descent, enabling simple pneumatic-hydraulic operation instead of complex mechanical crane systems.
2Manufacturing precision
If modules are lowered to the basin bottom using mechanical cranes, then they can be repositioned, but they may tip or roll during descent, resulting in improper placement
Solution Approach 1:
The buoyancy vessel provides controlled buoyant force during descent, counteracting gravity in a manageable way. This allows the module to be lowered steadily and positioned accurately at the basin bottom without the uncontrolled tipping or rolling that occurs with mechanical crane operations, ensuring proper placement orientation.
Solution Approach 2:
The patent applies parameter changes by controlling the buoyancy vessel's fill state (air vs. liquid) to adjust the module's overall density and buoyancy characteristics. This enables controlled descent and precise positioning, allowing the module to be lowered steadily and placed accurately without tipping or rolling.
3Productivity
If individual diffuser modules are positioned in a grid pattern throughout the basin, then thorough mixing and aeration are provided, but maintenance and repair become problematic due to inaccessibility
Solution Approach 1:
The buoyancy vessel enables individual modules to be lifted from any location in the grid pattern using pneumatic buoyancy rather than mechanical cranes. This maintains the beneficial grid distribution for thorough mixing and aeration while making maintenance accessible, as modules can be retrieved regardless of their position in the basin.
Solution Approach 2:
The pneumatic-hydraulic buoyancy system provides a simple, accessible method for module retrieval that works regardless of location in the grid pattern. Air pumps and flow controls can be positioned at the basin edge, providing easy access for maintenance while maintaining the grid configuration for optimal aeration performance.
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
Enables easy and cost-effective individual module maintenance and repair by allowing surface retrieval and repositioning without mechanical cranes, reducing the risk of improper placement and maintaining horizontal orientation during descent, thus simplifying maintenance processes and reducing operational costs.
Implementation Method 1
A diffuser assembly with a buoyancy vessel arrangement that is capable of providing individual raising, surface retrieval and lowering of the diffuser assembly
Implementation Method 2
The buoyancy vessel opening, in one embodiment, is at the end of a down turned elbow, with the opening being positioned below the lowest portion of the buoyancy vessel when the vessel is in a substantially horizontal orientation
Data Source
AI summary
A diffuser assembly with a buoyancy vessel and a chamber for buoyantly raising the diffuser assembly for maintenance work. The diffuser assembly has a support structure, diffusers connected to the frame, and a buoyancy vessel positioned on the frame, capable of alternating between a state of buoyancy or ballast.