Magnetic drive pumps and their bearings
Magnetic drive pumps were originally designed to pump toxic and other dangerous fluids without the use of mechanical seals. This is achieved by retaining the pumpage inside the pump casing and a containment shell, while the impeller shaft is supported on sleeve bearings lubricated by that pumpage. The impeller shaft is driven by a magnetic field passing through the containment shell from the driver shaft.
When a metal containment shell is used, adequate removal of the heat generated by eddy currents is vital, particularly when the liquid being pumped is sensitive to temperature changes.
Pump Bearings
A major difference between magnetic drive pump and the conventional style is the location and type of bearings. In conventional pump designs, the bearings are usually located well away from the pumped liquid in a well controlled environment, and the operator has a wide choice of lubricants that can be utilized.
Pneumatic and electric diaphragm pumps
2012-08-21
