Permanent Magnet Molten Metal Stirring Device Heat Management
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Solution Overview
Problem
Existing molten metal stirring devices face issues with high power consumption, complex maintenance, and high replacement costs, particularly in electromagnetic and mechanical stirring systems, and suffer from performance degradation due to heat generation in permanent magnet-based systems.
Innovation Solution
A permanent magnet-type molten metal stirring device with a support body that suppresses heat transfer, a magnetic field unit with vertically extending magnetic lines, and a drive unit that uses electromagnetic force to stir molten metal, featuring a cylindrical drive unit and electrodes to intersect magnetic lines and current, allowing for adjustable installation and reduced maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic coil stirring device is used, then stirring function is achieved, but power consumption increases and maintenance becomes complicated
Solution Approach 1:
The patent replaces electromagnetic coil-based electromagnetic stirring with a permanent magnet-based system. The permanent magnet generates a static magnetic field that interacts with induced currents in the molten metal to produce stirring force, eliminating the need for high-power electromagnetic coils and their associated power consumption and maintenance issues.
Solution Approach 2:
The permanent magnet system utilizes the electrical conductivity of the molten metal itself to generate the necessary currents through electromagnetic induction. The molten metal acts as both the working fluid and the conductor, eliminating the need for external electromagnetic coils and reducing system complexity and power requirements.
2Reliability
If mechanical stirring device with rotary vanes is used, then direct stirring is achieved, but replacement cost increases due to intensive wear
Solution Approach 1:
The patent replaces mechanical rotary vane stirring with a magnetic field-based electromagnetic stirring system. The permanent magnet generates a magnetic field that induces currents in the molten metal, producing electromagnetic forces for stirring without any mechanical contact with the molten metal, thereby eliminating wear and replacement costs.
3Ease of repair
If furnace is stopped for rotary vane replacement, then maintenance is performed, but downtime loss increases significantly
Solution Approach 1:
The permanent magnet electromagnetic stirring system eliminates mechanical rotary vanes that require replacement. The permanent magnet and its magnetic field system have no consumable wearing parts, allowing continuous operation without shutdown for maintenance, thereby eliminating downtime losses.
4Reliability
If permanent magnet system is used, then stirring function is achieved, but heat generation from furnace plate deteriorates performance
Solution Approach 1:
The patent introduces a water-cooled plate as an intermediary between the permanent magnet and the furnace's hot wall. This cooling plate acts as a thermal barrier and heat dissipation path, conducting heat away from the permanent magnet to prevent temperature rise that would deteriorate magnetic performance.
Solution Approach 2:
The patent changes the thermal parameters of the system by introducing active cooling to the permanent magnet assembly. By controlling the temperature of the permanent magnet through water cooling, the magnetic performance is maintained despite the high-temperature environment of the molten metal processing.
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 provides an energy-saving, easily maintainable, and flexible stirring device that can adjust performance, reducing heat generation and maintenance costs while maintaining effective stirring capabilities, with the ability to operate across various molten metal types and apparatus configurations.
Implementation Method 1
a magnetic field unit that is provided above the support body and includes a permanent magnet allowing magnetic lines of force to vertically extend in the molten metal
Implementation Method 2
a drive unit that is provided below the support body and drives the molten metal with an electromagnetic force generated by the magnetic lines of force generated from the permanent magnet and current allowed to flow through the molten metal by the drive unit
Data Source
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Figure 5
AI summary
A permanent magnet-type molten metal stirring device includes: a support body that is capable of suppressing transfer of heat from molten metal; a magnetic field unit that is provided above the support body and includes a permanent magnet allowing magnetic lines of force to vertically extend in the molten metal; and a drive unit that is provided below the support body and drives the molten metal with an electromagnetic force generated by the magnetic lines of force generated from the permanent magnet and current allowed to flow through the molten metal by the drive unit, wherein the drive unit includes: -a cylindrical drive unit main body that is mounted on a lower portion of the support body and includes a passage formed therein and laterally extending in a longitudinal direction, and -a pair of electrodes that are provided at positions where the pair of electrodes being opposed each other along a width direction via the passage, the pair of electrodes being exposed to the passage, and the pair of electrodes allowing current in the molten metal, the current intersecting the magnetic lines of force.