Vortex-Based Molten Metal Pump Eliminates Riser Tube Clogging
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Solution Overview
Problem
Existing molten metal transfer pumps face issues with clogging due to accumulated metal droplets in narrow riser tubes, requiring frequent replacements and inefficient mixing of scrap metal into the molten bath.
Innovation Solution
A molten metal pump with a parabolically-shaped bottom end and a centrifugal impeller that creates a vortex within a vertical tube, allowing for efficient lifting, mixing, and pre-melting, while eliminating support posts and riser tubes to reduce component deterioration and facilitate cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a narrow riser tube is used to transfer molten metal, then the pump size is reduced, but the riser tube becomes clogged as metal droplets accumulate
Solution Approach 1:
The patent inverts the traditional approach by eliminating the riser tube entirely and using a downward-facing impeller that creates a vortex flow. Instead of lifting metal through a narrow vertical tube, the impeller draws metal down into the vortex chamber where it circulates and is discharged through a wide outlet, preventing clogging by reversing the flow direction and eliminating the problematic narrow vertical passage.
Solution Approach 2:
The patent extracts and eliminates the riser tube component from the system entirely. By removing this narrow vertical tube that was prone to clogging, the design avoids the problem at its source while still achieving effective molten metal transfer through the vortex-based circulation system.
2Reliability
If the riser tube diameter is increased to delay blockage, then clogging is delayed, but the pump complexity and support structure requirements increase
Solution Approach 1:
The patent removes the riser tube and support posts entirely from the design. By eliminating these components, the system achieves reliable molten metal transfer without the complexity of multiple support structures or the need to manage riser tube diameter for clogging prevention.
Solution Approach 2:
The patent combines the functions of the impeller, vortex chamber, and discharge mechanism into an integrated design. The downward-facing impeller directly creates the vortex flow within the chamber, eliminating the need for separate riser tubes and support structures that were required in traditional designs.
3Ease of manufacture
If scrap metal chips are simply allowed to fall into the molten bath or mixed by circulation pump, then the process is simple, but the chips are not fully immersed resulting in longer melt time
Solution Approach 1:
The patent uses the periodic rotation of the impeller to create cyclic vortex flow that repeatedly draws scrap metal chips down into the molten bath and forces them under the surface. This periodic action ensures complete immersion of chips during each rotation cycle, significantly reducing melt time while maintaining process simplicity.
Solution Approach 2:
The vortex flow generated by the impeller automatically draws scrap metal chips into the molten bath and forces them underneath the surface without requiring additional mechanisms. The system uses its own vortex flow to achieve complete chip immersion, eliminating the need for separate mixing or immersion devices.
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 vortex-based pump design effectively prevents clogging, allows for complete immersion of scrap metal, and reduces the complexity and maintenance needs of the system, enhancing the efficiency of molten metal transfer and processing.
Implementation Method 1
The rotation of the impeller centered in the parabola results in the ejected flow of molten metal to create a vortex which climbs the inner walls of the body to a outlet opening in an upper portion wall
Implementation Method 2
A centrifugal impeller is seated in an inlet opening formed in the center of the bottom end
Data Source
AI summary
A pump for processing molten metal having an enlarged tubular body which houses a centrifugal pump at its bottom end. The bottom end has a parabolic shape which receives the ejected molten metal from the impeller and forms a vortex within the tubular body. The pump is controlled to cause the vortex to climb up the inner wall of the body up to and out of an outlet formed in the upper end of the body. A radial vane impeller is formed in the back plate of the impeller. When the impeller is rotated, solid particles introduced into the body are accelerated radially by the back plate impeller into the vortex.