Magnetic pump rotor
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Today, one of the magnetic pumps in our factory suddenly stopped pumping fluid. We initially thought that demagnetization of the inner and outer rotors was the cause, so we began to inspect the pump; it turned out that the shaft of the inner rotor had broken, with the break occurring on the side of the inner rotor； This shaft was just replaced about 3 months ago; let’s analyze what might be causing this issue.
Magnetic pump dryness is minimal, but the common reasons for shaft breakage are related to the following points: 1. The torque on the shaft is too high, usually due to overload. 2. The shaft has cracks. 3. The vibration is too strong. 4. Axis bending. 5. The shaft may become thinner due to wear, corrosion, and other reasons.
The information provided by the poster is incomplete; for example, what medium is your magnetic pump used to transport, and what material is the pump shaft made of? It has been in use for three months, so logically the medium should not be corrosive to the pump shaft. For the pump shafts of your magnetic pump factory, are ceramic or similar materials used, or stainless steel or similar? If it is the former, due to its high brittleness, fractures occur from time to time. Furthermore, magnetic pump must not be operated without liquid; check to see if there has been any interruption in the flow of liquid, as dry friction resulting from such interruptions can also lead to the breakage of the pump shaft
To prevent idling and dry running, it is recommended to install a pump anti-idling protection device that will automatically shut down the pump within 2 seconds when idling occurs, thus protecting the pump from damage. The address for the electronic brochure is: http://www.dnpump.com/PicUp/200910162202501.pdf. If you want to minimize maintenance efforts, it’s better to choose a protective device against idling and dry running – it saves time!