Open Exit Molten Metal Pump Outlet Passage Design
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Solution Overview
Problem
Molten metal pumps in the aluminum recycling industry face issues with clogging and mechanical damage due to the buildup of magnesium chloride, which interrupts production and poses health and safety hazards, as existing designs are prone to blockages and require frequent cleaning, especially in the discharge region.
Innovation Solution
The design modifies the outlet passage of the molten metal pump by removing a portion of the bottom wall and tapering the side and bottom walls outward, while keeping the top wall horizontal, to improve chlorine absorption and reduce mechanical stress, thereby reducing clogging and increasing chlorine injection rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pump operates continuously to maintain production, then productivity is improved, but magnesium chloride buildup clogs the discharge region interrupting production
Solution Approach 1:
The patent removes the bottom wall of the discharge region entirely, extracting the problematic area where magnesium chloride buildup occurs. This open-bottom design prevents accumulation of the reaction byproduct at the lowest point of the discharge region, eliminating the clogging issue that interrupts continuous operation.
Solution Approach 2:
The patent introduces a vertical dimension solution by removing the bottom wall and creating an open downward-facing discharge region. This dimensional change allows magnesium chloride to drain away vertically rather than accumulating horizontally in the traditional enclosed discharge region, enabling continuous operation without blockages.
2Reliability
If frequent cleaning is performed to remove magnesium chloride buildup, then complete chlorine reaction is maintained, but production is interrupted and graphite damage occurs
Solution Approach 1:
The open-bottom discharge region design allows the system to self-clean by enabling gravity-driven drainage of magnesium chloride away from the discharge area. The design inherently prevents buildup without requiring external intervention, eliminating the need for frequent manual cleaning operations that interrupt production and risk damaging the graphite pump components.
3Ease of manufacture
If the outlet passage has vertical walls to simplify manufacturing, then ease of manufacture is improved, but chlorine absorption and turbulence are reduced
Solution Approach 1:
The patent applies different geometric characteristics to different regions of the outlet passage. The upper portion maintains vertical walls for manufacturing simplicity, while the lower discharge region features tapered walls that converge downward. This local differentiation optimizes chlorine absorption and turbulence in the critical discharge zone where magnesium chloride buildup occurs, while maintaining ease of manufacture in the upper sections.
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 enhances chlorine absorption, reduces clogging, and increases productivity by maintaining higher chlorine injection rates and turbulence, leading to improved melt rates and reduced production interruptions.
Implementation Method 1
increases productivity by maintaining higher chlorine injection rates and turbulence
Implementation Method 2
the removal of magnesium has become a particular focus within the industry. The ability to remove magnesium from molten aluminum is made possible by a favorable chemical reaction between magnesium and chlorine. The reaction of the molten aluminum alloy bath with chlorine ultimately results in the formation of magnesium chloride
Implementation Method 3
The design modifies the outlet passage of the molten metal pump by removing a portion of the bottom wall and tapering the side and bottom walls outward, while keeping the top wall horizontal, to improve chlorine absorption
Data Source
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AI summary
A molten metal pump comprised of a base defining a pumping chamber, an impeller disposed within said pumping chamber, an outlet passage extending from said pumping chamber, said outlet passage being defined by opposed top and bottom walls and opposed side walls, wherein said top and side walls terminate at an intersection with a boundary of the base and said bottom wall terminates inward from said boundary.