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Magnetic Stirrers
Basically a magnetic mixer is like a conventional mechanical mixer — it has a motor, a driveshaft, and mixing blades that mix stuff in a tank. Technically the term used for the mixing blade assembly in mixers is “impeller.” A propeller on a boat or an airplane is also a type of impeller. Impellers are designed to move liquids or gasses by rotating. What makes a magnetic mixer different from a conventional mixer is that the motor uses magnets to move the impeller. This works by attaching one set of magnets to the motor driveshaft and another set of magnets to the impeller.
The advantage of magnetic stirrers is the suppression of sealing technology. The rotation of mixing elements is enabled by a magnetic field creating a touch-less torque transmission. The mixing head can be equipped with several different mixing elements such as propellers or flat disc turbines, to suit a particular application.
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Working Principle
The driveshaft is on the outside of the tank and the impeller is on the inside, and they are only connected by the attraction between the two sets of magnets. A hole is cut in the bottom of the tank, and a cup-like piece called a “mounting post” is inserted through and welded into that hole so that it protrudes into the tank. When you turn on the motor, the driveshaft turns its magnets, and the magnets on the impeller respond by turning along with the drive magnets. This makes the impeller blades turn, and the contents of the tank start mixing.
Capacity
The smallest mixer we have drives 20 inch-pounds of torque, and is about 3 inches in diameter at its narrowest point. We have used that mixer in tanks as small as 1.2 liters and as large as 350 liters. We are just finishing design work on what will be our largest unit, which will drive 1600 inch-pounds of torque. Depending on what level of agitation you are looking for, it will have the capability to mix up to 20,000 liters.
