During the use of the magnetic drive pump, some users reported that the magnetic steel was demagnetized, which caused the pump to fail to operate normally. Therefore, it was considered that the quality of the magnetic steel produced by the company was a problem. However, after many after-sales analysis, we found that there are some problems in the early design or later use of the user, which led to the demagnetization of the magnetic steel. Therefore, in order to reduce the user's cost of use and avoid unnecessary losses, today we will talk about several reasons for demagnetization of magnetic steel.
1. The operating temperature is unreasonable. The temperature of the material conveyed by the pump is too high, exceeding the allowable operating temperature of the magnetic material. For example, for a pump using NdFeB magnets, the operating temperature should be less than 150°C. If the system temperature exceeds 150°C, the magnets will be demagnetized quickly.
2. Long-term low-head operation. For example, the rated flow rate is 25 m3/h and the lift is 50m. If the operation deviates from the rated point (for example, the lift is only more than 10 meters), the internal return pressure of the pump will drop, the circulation will not be smooth, and the metal isolation sleeve eddy current belt will not go away, and its temperature will rise sharply. Magnets will also demagnetize.
3. The pipeline matching is unreasonable. For example, the inlet is required to be equipped with DN65 pipeline. If the pipeline is less than 65mm, the flow will be in short supply, which will easily cause poor internal circulation, heat is not easily taken away, and the system temperature exceeds the operating temperature of the magnetic steel.
4. The sliding bearing is worn and not replaced in time. If it is not replaced in time, there will be friction between the inner magnetic rotor and the inner wall of the isolation sleeve, causing the temperature of the isolation sleeve to rise and the magnetic steel to demagnetize.
5. The magnetic pump runs idly. In this case, the temperature of the metal isolation sleeve and the inner magnetic rotor rises sharply, exceeding the operating temperature of the magnetic steel, which will quickly lead to the demagnetization of the magnetic steel of the inner magnetic rotor.
6. The pump inlet and outlet lines are blocked. In this case, the magnetic pump will be idling, and the internal circulation of the pump will be affected, and the temperature will rise; and the blockage of the outlet pipeline will also cause the magnetic steel to demagnetize due to the circulation in the pump. If the pump inlet pipeline is equipped with a filter, the filter should be cleaned regularly to ensure that the filter area is within a reasonable range.
7. The rotor parts are abnormally stuck. The rotor part composed of the inner magnet and the impeller is stuck by mechanical impurities and cannot run, but the motor does not stop in time, which will lead to demagnetization of the magnetic steel.
8. Cavitation phenomenon. The cavitation phenomenon of the pump will cause the demagnetization of the magnetic steel for various reasons.
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