Enviri has filed a patent for an apparatus and method to stir molten metal. The electromagnetic stirrer includes a core with multiple teeth and electrically conducting coils. The design allows for a small air gap between the teeth and the container, even with curved walls or bases. GlobalData’s report on Enviri gives a 360-degree view of the company including its patenting strategy.
According to GlobalData’s company profile on Enviri, railway traffic navigation systems was a key innovation area identified from patents. Enviri's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
Apparatus for stirring molten metal using electromagnetic stirrer
A recently filed patent (Publication Number: US20230204292A1) describes an apparatus for stirring molten metal using an electromagnetic stirrer. The apparatus includes a core with two or more teeth and electrically conducting coils. The teeth have end faces that may not be aligned with each other or with the base connector, depending on various conditions. The tooth end faces may be inclined at an angle relative to each other or to the base connector, or they may be parallel but not coplanar. Additionally, the tooth end faces may have a tooth edge and a tooth end face plane, which can be non-aligned with each other for different teeth. The extent and length of the teeth can also vary, with the outermost teeth potentially having a greater extent or length compared to the innermost teeth.
The patent also describes methods for manufacturing and using the apparatus. The non-planar characteristics of the container wall where stirring is required are measured, and based on these measurements, the tooth end faces are determined to be non-aligned. The extent of non-alignment is determined from the measurement of the non-planar characteristics of the wall. In the method of stirring molten metal, a current is applied to the electrically conducting coils at different times to generate different magnetic field configurations, causing movement of the molten metal within the container.
Overall, this patent presents an apparatus and methods for stirring molten metal using an electromagnetic stirrer with non-aligned tooth end faces. The non-alignment of the tooth end faces and the varying extent and length of the teeth allow for efficient stirring of the molten metal within the container. The invention provides a solution for improving the stirring process in metal casting or other applications where molten metal needs to be mixed effectively.