Low Pressure Molten Metal Transfer Pump Design
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Solution Overview
Problem
Existing molten metal transfer pumps often result in high-pressure discharges, leading to dross formation and inefficiencies, as they typically require multiple components and can create vortices that introduce turbulence and react with gases.
Innovation Solution
A low-pressure molten metal transfer pump design utilizing a robust, simplified configuration with a motor, impeller chamber, and a riser assembly that minimizes component count and avoids vortex formation by using a shaft and impeller within a pumping chamber and elongated tube, ensuring gentle metal rise and controlled discharge through a refractory material body and passage system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transfer pumps are used to pump molten metal, then the metal can be transferred from one furnace to another, but high-pressure discharge is created leading to dross formation and turbulence
Solution Approach 1:
The pump is segmented into distinct functional zones: an impeller chamber for metal intake and initial pumping, and a separate riser chamber for gentle metal rise and discharge. This segmentation allows the impeller to generate necessary pumping pressure while the riser provides a calm, low-turbulence path to discharge, preventing dross formation.
Solution Approach 2:
The riser chamber acts as an intermediary between the high-pressure impeller chamber and the discharge point. It serves as a transition zone where the molten metal can decelerate and stabilize before leaving the pump, effectively mediating between the pumping action and discharge requirements to minimize turbulence and dross.
2Reliability
If multiple pump components are used to transfer molten metal, then pumping function is achieved, but device complexity increases with more parts
Solution Approach 1:
The pump merges the impeller chamber and riser chamber into a single integrated pump body with a unified structure. The impeller chamber and riser chamber are connected internally, eliminating the need for external piping and multiple separate components. This consolidation maintains full pumping functionality while significantly reducing device complexity.
Solution Approach 2:
The pump body serves multiple functions simultaneously: it houses the impeller chamber for metal intake, contains the riser chamber for gentle rise, provides structural support, and facilitates discharge. This multi-functionality reduces the need for separate specialized components, thereby reducing overall device complexity.
3Productivity
If impeller rotation creates a vortex of molten metal, then metal can be pumped up the riser, but turbulence is created that reacts with gases
Solution Approach 1:
The pump design applies different flow characteristics to different zones: the impeller chamber generates rotational flow necessary for pumping action, while the riser chamber is designed with smooth walls and adequate diameter to promote laminar, non-vortex flow. This local differentiation of flow quality allows efficient metal rise without turbulence-induced gas reactions.
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 solution effectively reduces dross formation and operational complexity by achieving a low-pressure discharge with fewer components, minimizing turbulence and gas interaction, thereby enhancing the efficiency and reliability of molten metal transfer.
Implementation Method 1
Rotation of the impeller forces molten metal through the passage and into the elongated chamber
Data Source
AI summary
A pump for transferring molten metal is provided. The pump includes a motor, a base having an impeller chamber, a shaft connected to the motor at one end, an impeller connected to the other end of the shaft and rotatable in the impeller chamber, and a riser disposed on an upper surface of the base. The base includes a shaft opening and an outlet opening in a top surface. The riser assembly has a first open end facing the base. The first open end is dimensioned to encompass the shaft opening and the outlet opening.