Magnetic Mixer Design

Category:

Mixer Head Maintenance

PharmAseptic has over twenty fives years experience with several types of magnetically coupled mixers systems and magnetic mixer bearings.
Bearings by nature are a wear part and must be inspected often and replaced when wear or damage is identified.  The alternative is to replace bearings on a consistent PM schedule in order to avoid unplanned outages or damage to the mixer as well as the vessel.


Description

The common wear point on all bottom mounted magnetic coupled mixers using silicone carbide ceramic male posts is the axial face of the bearing at the transition point to the radial shaft. Look for excess wear on the axial (flat) face of the bearing and especially any evidence of hair line cracks. Of course any chips or cracks in other locations indicate that both male and female bearings should be replaced.

For mixers that use a threaded male post, the threaded part should be inspected for any wear. These parts are prone to work loose while in operation resulting to damage to the bearing as well as the tank plate and potential failure of the bearing while in operation.

In some ways similar to metal to metal galling, the same phenomena occurs with ceramics. By utilizing a Silicon Carbide sleeve and a Zirconium Oxide post you can reduce friction significantly and thus potential particle generation. In addition, Zirconium Oxide has greater mechanical properties and thus can withstand higher mechanical shock than Silicon Carbide. These mixers have an engineered tank plate and bearing design that eliminates this weak point and that provide some short duration dry running capabilities and are ideally suited for bioreactor applications that require an extended shaft

PharmAseptic can also supply two designs of top mounted magnetically coupled mixers systems. Please call for details.

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