Riserless Molten Metal Pump Vortex Mixing
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Solution Overview
Problem
Existing molten metal transfer and mixing pumps face issues such as clogging due to accumulated metal droplets, inefficient mixing of scrap metal, and high motor power consumption, along with limited space for integrated systems in molten metal facilities.
Innovation Solution
A molten metal pump design featuring a hybrid-drag turbine type with dual centrifugal impellers creating a forced, highly forced, or super forced vortex within a vertically oriented tube, combined with a mechanical gear train for torque enhancement and a thermal barrier coupling to reduce heat transfer, allowing for efficient lifting, mixing, and recirculation of molten metals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a narrow riser tube is used in transfer pumps, then the pump structure is compact, but the riser becomes clogged as metal droplets accumulate
Solution Approach 1:
The invention removes the riser tube component entirely from the pump system. The vortex lift mechanism elevates molten metal directly through the pump housing outlet without requiring a separate riser tube, thereby eliminating the clogging problem while maintaining compact dimensions.
Solution Approach 2:
Instead of using a vertical riser tube configuration that accumulates droplets, the invention uses a horizontal outlet configuration where the vortex flow directly discharges metal outward. This inverts the traditional flow path and eliminates the accumulation zone that causes clogging.
2Device complexity
If scrap metal chips are simply allowed to fall into the molten bath or mixed by circulation pump, then the system is simple, but the mixing is not effective and melt time is longer
Solution Approach 1:
The pump serves multiple functions: it transfers molten metal, mixes scrap chips, and pre-melts scrap material simultaneously. The vortex flow pattern provides intensive mixing and heating action, enabling the single device to perform what previously required separate mixing and transfer systems.
Solution Approach 2:
The pump pre-melts and mixes scrap chips before they enter the main furnace bath. By performing preliminary melting and mixing operations in the pump, the system reduces the overall melt time and improves productivity without adding complex separate mixing equipment.
3Use of energy by moving object
If a mechanical gear train is added for torque enhancement, then motor efficiency is optimized, but the device complexity increases
Solution Approach 1:
A mechanical gear train is introduced as an intermediary between the motor and pump impeller. The gear train reduces motor speed while increasing torque, allowing the motor to operate at its optimal efficiency point. This intermediary component enables energy optimization despite the added mechanical complexity.
4Reliability
If a thermal barrier coupling is implemented to reduce heat transfer, then motor protection is improved, but the device complexity increases
Solution Approach 1:
A thermal barrier coupling is introduced as an intermediary between the motor shaft and pump impeller shaft. This coupling reduces heat transfer from the molten metal environment to the motor, protecting the motor while allowing mechanical power transmission. The thermal barrier serves as a protective intermediary that addresses heat transfer issues without requiring complete system redesign.
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 design effectively prevents clogging, ensures thorough mixing of scrap metal, and operates at optimal motor efficiency by reducing RPM and increasing torque, while minimizing heat transfer and turbulence, thus enhancing the overall efficiency and productivity of molten metal processing.
Implementation Method 1
a centrifugal circulation pump to equalize the temperature of the molten bath. These pumps contain a rotating impeller that draws in and accelerates the molten metal creating a laminar-type flow within the furnace
Implementation Method 2
a pump creating a vortex within a lift tube to elevate and mix molten metal
Implementation Method 3
A molten metal pump design featuring a hybrid-drag turbine type with dual centrifugal impellers creating a forced, highly forced, or super forced vortex within a vertically oriented tube
Implementation Method 4
a thermal barrier coupling to reduce heat transfer
Data Source
AI summary
A pump for processing molten metal having an enlarged tubular body which houses a centrifugal lifting pump at its bottom end. The bottom end has a curved shape that aids in the formation and sustainability of: a) a forced vortex; b) a highly forced vortex; and c) a super forced vortex, depending on the application when it which receives the ejected molten metal from the lifting pump's impeller. The lifting 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 recirculation centrifugal pump is mounted coaxially to and rotates with the lifting impeller.