Riserless Molten Metal Pump with Curved Bottom Vortex
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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, leading to prolonged melt times.
Innovation Solution
A centrifugal pump design featuring an elongated body with a curved bottom end and a centrifugal impeller that creates a forced vertical vortex within a vertical tube, allowing for efficient lifting and mixing of molten metal, with a large internal diameter for easy cleaning and elimination of support posts and riser tubes, and radial vanes to direct scrap metal into the vortex for effective melting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a narrow riser tube is used in the transfer pump, then the pump can be more compact and efficient for metal transfer, but the riser tube becomes clogged as metal droplets accumulate, requiring frequent replacement
Solution Approach 1:
The invention removes the narrow riser tube component entirely from the pump system. By eliminating this vulnerable component that prone to clogging, the system achieves both continuous operation (reliability) and maintains transfer efficiency through the alternative vortex-based metal elevation mechanism in the enlarged pump cavity.
Solution Approach 2:
The invention separates the metal transfer function from the narrow riser tube by using a different mechanism - a vortex created by the impeller in an enlarged pump cavity. This segments the functions so that metal is elevated through rotational vortex flow rather than relying on a narrow vertical tube, preventing clogging while maintaining transfer capability.
2Reliability
If the riser tube diameter is increased to delay blockage, then the tube can operate longer before clogging, but the pump becomes larger and more complex
Solution Approach 1:
The invention merges the metal elevation function into the main pump cavity by creating a vortex that lifts metal along the cavity walls. This combines what would have been separate components (pump body and riser tube) into a single integrated structure, eliminating the need for a separate riser tube while maintaining the elevation function.
Solution Approach 2:
Instead of solving the clogging problem by increasing the riser tube diameter in one dimension, the invention transitions to a different dimensional approach by using rotational vortex flow. The metal is elevated through the rotational motion and centrifugal force in the pump cavity, changing from a linear vertical flow in a narrow tube to a rotational three-dimensional flow pattern.
3Productivity
If a centrifugal impeller is used to create a vortex for metal elevation, then mixing and transfer efficiency are improved, but the pump design becomes more complex compared to simple pumps
Solution Approach 1:
The centrifugal impeller in the invention serves multiple functions simultaneously: it transfers metal from the crucible, creates a vortex for elevation, and mixes the metal through rotational motion. This multi-functionality consolidates what would require separate components into a single impeller, reducing overall system complexity while achieving multiple objectives.
4Ease of repair
If support posts and riser tubes are eliminated from the pump design, then maintenance and cleaning become easier, but the structural support and metal lifting mechanisms must be redesigned
Solution Approach 1:
The pump cavity is designed with self-cleaning capabilities through the vortex flow pattern. The rotational flow naturally prevents metal droplet accumulation on the cavity walls, and the enlarged cavity allows operator access for manual cleaning if needed. The design serves itself by using the metal flow to prevent clogging without requiring additional cleaning mechanisms or components.
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 pump effectively prevents clogging by allowing easy access for cleaning, reduces component replacement, and ensures thorough immersion and melting of scrap metal, enhancing transfer, mixing, and pre-melting processes.
Implementation Method 1
The rotation of the impeller centered in the curved body's end results in the ejected flow of molten metal to create a vertical uplifting 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... The rotation of the impeller... results in the ejected flow of molten metal to create a vertical uplifting vortex
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 concave curved shape whose shape is a function of the particular type of vortex to be created for the application at hand. This curved portion of the body receives the ejected molten metal from the impeller and forms an uplifting axial vortex within the tubular section of the body. The pump is designed to cooperate synergistically with said body such that the uplifting axial 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.