How Early Electromagnetic Pumps Moved Liquid Metal Using Magnetic Fields

A 1927 patent for a pump that uses electromagnetic forces to move conductive liquids without needing moving mechanical parts like pistons or impellers.

What it covers

The patent describes a device that moves electrically conductive fluids, such as liquid metals, by applying a magnetic field and an electric current perpendicular to each other. This interaction creates a Lorentz force, which pushes the fluid through a conduit. Because the force acts directly on the fluid itself, the design eliminates the need for traditional mechanical components like gears, valves, or rotating blades that would otherwise wear out or leak when handling harsh molten materials.

What it doesn't cover

• —Does not cover pumps designed for non-conductive fluids like water or oil.
• —Does not cover mechanical pumping mechanisms that rely on physical impellers or pistons.
• —Does not cover systems that lack an integrated electromagnetic field source.

The clever bit

The invention bypasses the 'moving parts' problem by treating the liquid metal as a conductor in a motor, effectively turning the fluid itself into the rotor of an electromagnetic pump.

Why it matters

This technology was a precursor to modern liquid metal cooling systems used in specialized reactors and industrial metallurgy. By removing mechanical wear points, it allowed for the handling of materials that would destroy standard pumps.

Real-world examples

• 1.Liquid metal cooling loops in fast-neutron nuclear reactors
• 2.Molten salt processing in chemical manufacturing
• 3.Industrial die-casting equipment for molten aluminum