Working principle and performance characteristics of magnetic stirrer

The magnetic stirrer uses the principle of magnetic field and vortex to place the container of the liquid to be stirred into the stirrer on the base of the magnetic stirrer. When the magnetic stirrer is energized, a rotating magnetic field is generated near the base to drive the stirrer into a circular cycle. Movement, and then a vortex is formed in the container liquid, so as to achieve the purpose of stirring the liquid. 

At present, there are mainly two types of stirrers in the laboratory: electric stirrers and magnetic stirrers. Among them, magnetic stirrers are suitable for liquids or solid-liquid mixtures with low viscosity.

Compared with electric stirrers, magnetic stirrers have the following advantages:

1.Using high-quality DC motor, low noise, stable speed regulation;

2. The stir bar made of high-quality magnetic steel coated with PTFE, which is heat-resistant, wear-resistant and corrosion-resistant;

3. The mixing work is carried out in a sealed container, which is ideal and convenient to use;

4. The auxiliary heating device can be integrated into the system, which greatly facilitates applications that require simultaneous stirring and heating. To

A general magnetic stirrer can have both stirring and heating functions at the same time.

The effect of stirring: 1) Mix the reactants uniformly, make the temperature distribution uniform, and accelerate the reaction rate or evaporation rate, thereby shortening the reaction time; 2) When heated in a closed container, magnetic stirring can prevent bumping. The function of heating: Of course, this function is for specific applications. The temperature controlled by the heater integrated on the magnetic stirrer is generally between room temperature and 100°C. The simple magnetic stirrer only has the function of stirring.