Rotary Stirring Device with Multi-Directional Gas Outlets
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Solution Overview
Problem
Existing rotary devices for treating molten metal are inefficient in degassing and removing solid impurities, leading to defects in solidified products and reduced durability due to the size and distribution of gas bubbles.
Innovation Solution
A rotary device with a rotor having laterally and upwardly directed outlets, allowing for the creation of smaller and more numerous gas bubbles, which enhances degassing efficiency and allows for reduced rotation speed or shorter treatment times while maintaining efficiency, thus extending the life of the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional rotary devices with single-direction outlets are used, then the device structure is simple, but degassing efficiency is low and treatment time is long
Solution Approach 1:
The rotor is divided into multiple compartments with separate inlet and outlet passages. Each compartment handles gas dispersion independently, allowing simultaneous multi-directional gas release (upward and lateral outlets) which significantly improves degassing efficiency and reduces treatment time
Solution Approach 2:
The invention introduces multi-directional gas dispersion by providing both upward outlets in the roof and lateral outlets in the base of each compartment. This three-dimensional gas release pattern enhances mass transfer efficiency compared to conventional single-direction outlets, reducing the time required for effective degassing
2Productivity
If higher rotation speed is used to improve degassing efficiency, then gas bubble dispersion is enhanced, but device wear increases and durability decreases
Solution Approach 1:
The rotor is segmented into multiple compartments with separate flow paths. This segmentation allows gas to be dispersed through multiple smaller outlets rather than requiring high-speed rotation of a single outlet, reducing mechanical stress and wear while maintaining effective degassing efficiency
Solution Approach 2:
The invention changes the operational parameters by using multiple outlets at different orientations (upward and lateral) to achieve effective gas dispersion at lower rotation speeds. This parameter change reduces centrifugal forces and mechanical wear on the rotor and shaft, extending device durability
3Productivity
If conventional single-direction gas outlets are used, then the device structure is simple, but gas bubble size is large and degassing efficiency is low
Solution Approach 1:
The rotor is divided into multiple compartments, each with its own inlet and outlet passages. This segmentation creates multiple small gas release points instead of single large outlets, producing smaller gas bubbles that rise more efficiently and improve degassing performance
Solution Approach 2:
The invention adds vertical dimension to gas dispersion by incorporating upward outlets in the roof in addition to lateral outlets in the base. This multi-directional approach creates smaller, more numerous bubbles that disperse more effectively through the molten metal, improving degassing efficiency despite increased structural complexity
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 device achieves significantly more efficient degassing and cleaning, reducing hydrogen content and solid impurities, leading to higher durability and longer life of the rotary device, with improved removal of defects in molten metal products.
Implementation Method 1
the combination of laterally directed and upwardly directed outlets allows smaller and more numerous bubbles of gas to be created which results in significantly more efficient degassing
Implementation Method 2
more efficient removal of solid impurities such as oxide inclusions
Data Source
AI summary
The invention relates to a rotary device for dispersing a gas in a molten metal. The device comprises a hollow shaft at one end of which is attached a rotor. The rotor has a roof and a base which are spaced apart and connected by a plurality of vanes. A compartment is defined between each adjacent pair of vanes and the roof and the base, and each compartment has an inlet and first and second outlets. A flow path is defined through the shaft into the inlets of the compartments and out of the first and second outlets. Each first outlet is disposed radially outwardly of the respective inlet and arranged to disperse gas laterally of the rotor in use, and each second outlet is disposed in the roof of the rotor and arranged to disperse gas upwardly from the rotor in use.